{
  "contractName": "SafeMath",
  "abi": [],
  "bytecode": "0x604c602c600b82828239805160001a60731460008114601c57601e565bfe5b5030600052607381538281f30073000000000000000000000000000000000000000030146080604052600080fd00a165627a7a723058203f804909bf490f64a62ccb27d61c9b0dc3d5f36f009286fa595d432cfed69dad0029",
  "deployedBytecode": "0x73000000000000000000000000000000000000000030146080604052600080fd00a165627a7a723058203f804909bf490f64a62ccb27d61c9b0dc3d5f36f009286fa595d432cfed69dad0029",
  "sourceMap": "117:1251:1:-;;132:2:-1;166:7;155:9;146:7;137:37;252:7;246:14;243:1;238:23;232:4;229:33;270:1;265:20;;;;222:63;;265:20;274:9;222:63;;298:9;295:1;288:20;328:4;319:7;311:22;352:7;343;336:24",
  "deployedSourceMap": "117:1251:1:-;;;;;;;;",
  "source": "pragma solidity ^0.4.24;\n\n\n/**\n * @title SafeMath\n * @dev Math operations with safety checks that throw on error\n */\nlibrary SafeMath {\n\n  /**\n  * @dev Multiplies two numbers, throws on overflow.\n  */\n  function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {\n    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the\n    // benefit is lost if 'b' is also tested.\n    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522\n    if (_a == 0) {\n      return 0;\n    }\n\n    c = _a * _b;\n    assert(c / _a == _b);\n    return c;\n  }\n\n  /**\n  * @dev Integer division of two numbers, truncating the quotient.\n  */\n  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {\n    // assert(_b > 0); // Solidity automatically throws when dividing by 0\n    // uint256 c = _a / _b;\n    // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold\n    return _a / _b;\n  }\n\n  /**\n  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).\n  */\n  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {\n    assert(_b <= _a);\n    return _a - _b;\n  }\n\n  /**\n  * @dev Adds two numbers, throws on overflow.\n  */\n  function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {\n    c = _a + _b;\n    assert(c >= _a);\n    return c;\n  }\n}\n",
  "sourcePath": "openzeppelin-solidity/contracts/math/SafeMath.sol",
  "ast": {
    "absolutePath": "openzeppelin-solidity/contracts/math/SafeMath.sol",
    "exportedSymbols": {
      "SafeMath": [
        138
      ]
    },
    "id": 139,
    "nodeType": "SourceUnit",
    "nodes": [
      {
        "id": 46,
        "literals": [
          "solidity",
          "^",
          "0.4",
          ".24"
        ],
        "nodeType": "PragmaDirective",
        "src": "0:24:1"
      },
      {
        "baseContracts": [],
        "contractDependencies": [],
        "contractKind": "library",
        "documentation": "@title SafeMath\n@dev Math operations with safety checks that throw on error",
        "fullyImplemented": true,
        "id": 138,
        "linearizedBaseContracts": [
          138
        ],
        "name": "SafeMath",
        "nodeType": "ContractDefinition",
        "nodes": [
          {
            "body": {
              "id": 78,
              "nodeType": "Block",
              "src": "274:309:1",
              "statements": [
                {
                  "condition": {
                    "argumentTypes": null,
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 57,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "argumentTypes": null,
                      "id": 55,
                      "name": "_a",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 48,
                      "src": "489:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "==",
                    "rightExpression": {
                      "argumentTypes": null,
                      "hexValue": "30",
                      "id": 56,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "495:1:1",
                      "subdenomination": null,
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_0_by_1",
                        "typeString": "int_const 0"
                      },
                      "value": "0"
                    },
                    "src": "489:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "falseBody": null,
                  "id": 61,
                  "nodeType": "IfStatement",
                  "src": "485:36:1",
                  "trueBody": {
                    "id": 60,
                    "nodeType": "Block",
                    "src": "498:23:1",
                    "statements": [
                      {
                        "expression": {
                          "argumentTypes": null,
                          "hexValue": "30",
                          "id": 58,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": true,
                          "kind": "number",
                          "lValueRequested": false,
                          "nodeType": "Literal",
                          "src": "513:1:1",
                          "subdenomination": null,
                          "typeDescriptions": {
                            "typeIdentifier": "t_rational_0_by_1",
                            "typeString": "int_const 0"
                          },
                          "value": "0"
                        },
                        "functionReturnParameters": 54,
                        "id": 59,
                        "nodeType": "Return",
                        "src": "506:8:1"
                      }
                    ]
                  }
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 66,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftHandSide": {
                      "argumentTypes": null,
                      "id": 62,
                      "name": "c",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 53,
                      "src": "527:1:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "Assignment",
                    "operator": "=",
                    "rightHandSide": {
                      "argumentTypes": null,
                      "commonType": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "id": 65,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": false,
                      "lValueRequested": false,
                      "leftExpression": {
                        "argumentTypes": null,
                        "id": 63,
                        "name": "_a",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 48,
                        "src": "531:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "nodeType": "BinaryOperation",
                      "operator": "*",
                      "rightExpression": {
                        "argumentTypes": null,
                        "id": 64,
                        "name": "_b",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 50,
                        "src": "536:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "src": "531:7:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "527:11:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "id": 67,
                  "nodeType": "ExpressionStatement",
                  "src": "527:11:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "arguments": [
                      {
                        "argumentTypes": null,
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 73,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "argumentTypes": null,
                          "commonType": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          },
                          "id": 71,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftExpression": {
                            "argumentTypes": null,
                            "id": 69,
                            "name": "c",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 53,
                            "src": "551:1:1",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "nodeType": "BinaryOperation",
                          "operator": "/",
                          "rightExpression": {
                            "argumentTypes": null,
                            "id": 70,
                            "name": "_a",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 48,
                            "src": "555:2:1",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "src": "551:6:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": "==",
                        "rightExpression": {
                          "argumentTypes": null,
                          "id": 72,
                          "name": "_b",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 50,
                          "src": "561:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "src": "551:12:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      ],
                      "id": 68,
                      "name": "assert",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 560,
                      "src": "544:6:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$",
                        "typeString": "function (bool) pure"
                      }
                    },
                    "id": 74,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "544:20:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_tuple$__$",
                      "typeString": "tuple()"
                    }
                  },
                  "id": 75,
                  "nodeType": "ExpressionStatement",
                  "src": "544:20:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 76,
                    "name": "c",
                    "nodeType": "Identifier",
                    "overloadedDeclarations": [],
                    "referencedDeclaration": 53,
                    "src": "577:1:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 54,
                  "id": 77,
                  "nodeType": "Return",
                  "src": "570:8:1"
                }
              ]
            },
            "documentation": "@dev Multiplies two numbers, throws on overflow.",
            "id": 79,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "mul",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 51,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 48,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 79,
                  "src": "216:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 47,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "216:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 50,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 79,
                  "src": "228:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 49,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "228:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "215:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 54,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 53,
                  "name": "c",
                  "nodeType": "VariableDeclaration",
                  "scope": 79,
                  "src": "263:9:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 52,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "263:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "262:11:1"
            },
            "scope": 138,
            "src": "203:380:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 92,
              "nodeType": "Block",
              "src": "734:214:1",
              "statements": [
                {
                  "expression": {
                    "argumentTypes": null,
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 90,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "argumentTypes": null,
                      "id": 88,
                      "name": "_a",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 81,
                      "src": "936:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "/",
                    "rightExpression": {
                      "argumentTypes": null,
                      "id": 89,
                      "name": "_b",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 83,
                      "src": "941:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "936:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 87,
                  "id": 91,
                  "nodeType": "Return",
                  "src": "929:14:1"
                }
              ]
            },
            "documentation": "@dev Integer division of two numbers, truncating the quotient.",
            "id": 93,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "div",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 84,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 81,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 93,
                  "src": "678:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 80,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "678:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 83,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 93,
                  "src": "690:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 82,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "690:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "677:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 87,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 86,
                  "name": "",
                  "nodeType": "VariableDeclaration",
                  "scope": 93,
                  "src": "725:7:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 85,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "725:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "724:9:1"
            },
            "scope": 138,
            "src": "665:283:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 112,
              "nodeType": "Block",
              "src": "1129:47:1",
              "statements": [
                {
                  "expression": {
                    "argumentTypes": null,
                    "arguments": [
                      {
                        "argumentTypes": null,
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 105,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "argumentTypes": null,
                          "id": 103,
                          "name": "_b",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 97,
                          "src": "1142:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": "<=",
                        "rightExpression": {
                          "argumentTypes": null,
                          "id": 104,
                          "name": "_a",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 95,
                          "src": "1148:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "src": "1142:8:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      ],
                      "id": 102,
                      "name": "assert",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 560,
                      "src": "1135:6:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$",
                        "typeString": "function (bool) pure"
                      }
                    },
                    "id": 106,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1135:16:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_tuple$__$",
                      "typeString": "tuple()"
                    }
                  },
                  "id": 107,
                  "nodeType": "ExpressionStatement",
                  "src": "1135:16:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 110,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "argumentTypes": null,
                      "id": 108,
                      "name": "_a",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 95,
                      "src": "1164:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "-",
                    "rightExpression": {
                      "argumentTypes": null,
                      "id": 109,
                      "name": "_b",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 97,
                      "src": "1169:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "1164:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 101,
                  "id": 111,
                  "nodeType": "Return",
                  "src": "1157:14:1"
                }
              ]
            },
            "documentation": "@dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).",
            "id": 113,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "sub",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 98,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 95,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 113,
                  "src": "1073:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 94,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1073:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 97,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 113,
                  "src": "1085:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 96,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1085:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1072:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 101,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 100,
                  "name": "",
                  "nodeType": "VariableDeclaration",
                  "scope": 113,
                  "src": "1120:7:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 99,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1120:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1119:9:1"
            },
            "scope": 138,
            "src": "1060:116:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 136,
              "nodeType": "Block",
              "src": "1309:57:1",
              "statements": [
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 126,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftHandSide": {
                      "argumentTypes": null,
                      "id": 122,
                      "name": "c",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 120,
                      "src": "1315:1:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "Assignment",
                    "operator": "=",
                    "rightHandSide": {
                      "argumentTypes": null,
                      "commonType": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "id": 125,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": false,
                      "lValueRequested": false,
                      "leftExpression": {
                        "argumentTypes": null,
                        "id": 123,
                        "name": "_a",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 115,
                        "src": "1319:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "nodeType": "BinaryOperation",
                      "operator": "+",
                      "rightExpression": {
                        "argumentTypes": null,
                        "id": 124,
                        "name": "_b",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 117,
                        "src": "1324:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "src": "1319:7:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "1315:11:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "id": 127,
                  "nodeType": "ExpressionStatement",
                  "src": "1315:11:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "arguments": [
                      {
                        "argumentTypes": null,
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 131,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "argumentTypes": null,
                          "id": 129,
                          "name": "c",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 120,
                          "src": "1339:1:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": ">=",
                        "rightExpression": {
                          "argumentTypes": null,
                          "id": 130,
                          "name": "_a",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 115,
                          "src": "1344:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "src": "1339:7:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      ],
                      "id": 128,
                      "name": "assert",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 560,
                      "src": "1332:6:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$",
                        "typeString": "function (bool) pure"
                      }
                    },
                    "id": 132,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1332:15:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_tuple$__$",
                      "typeString": "tuple()"
                    }
                  },
                  "id": 133,
                  "nodeType": "ExpressionStatement",
                  "src": "1332:15:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 134,
                    "name": "c",
                    "nodeType": "Identifier",
                    "overloadedDeclarations": [],
                    "referencedDeclaration": 120,
                    "src": "1360:1:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 121,
                  "id": 135,
                  "nodeType": "Return",
                  "src": "1353:8:1"
                }
              ]
            },
            "documentation": "@dev Adds two numbers, throws on overflow.",
            "id": 137,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "add",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 118,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 115,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 137,
                  "src": "1251:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 114,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1251:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 117,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 137,
                  "src": "1263:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 116,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1263:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1250:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 121,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 120,
                  "name": "c",
                  "nodeType": "VariableDeclaration",
                  "scope": 137,
                  "src": "1298:9:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 119,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1298:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1297:11:1"
            },
            "scope": 138,
            "src": "1238:128:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          }
        ],
        "scope": 139,
        "src": "117:1251:1"
      }
    ],
    "src": "0:1369:1"
  },
  "legacyAST": {
    "absolutePath": "openzeppelin-solidity/contracts/math/SafeMath.sol",
    "exportedSymbols": {
      "SafeMath": [
        138
      ]
    },
    "id": 139,
    "nodeType": "SourceUnit",
    "nodes": [
      {
        "id": 46,
        "literals": [
          "solidity",
          "^",
          "0.4",
          ".24"
        ],
        "nodeType": "PragmaDirective",
        "src": "0:24:1"
      },
      {
        "baseContracts": [],
        "contractDependencies": [],
        "contractKind": "library",
        "documentation": "@title SafeMath\n@dev Math operations with safety checks that throw on error",
        "fullyImplemented": true,
        "id": 138,
        "linearizedBaseContracts": [
          138
        ],
        "name": "SafeMath",
        "nodeType": "ContractDefinition",
        "nodes": [
          {
            "body": {
              "id": 78,
              "nodeType": "Block",
              "src": "274:309:1",
              "statements": [
                {
                  "condition": {
                    "argumentTypes": null,
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 57,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "argumentTypes": null,
                      "id": 55,
                      "name": "_a",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 48,
                      "src": "489:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "==",
                    "rightExpression": {
                      "argumentTypes": null,
                      "hexValue": "30",
                      "id": 56,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": true,
                      "kind": "number",
                      "lValueRequested": false,
                      "nodeType": "Literal",
                      "src": "495:1:1",
                      "subdenomination": null,
                      "typeDescriptions": {
                        "typeIdentifier": "t_rational_0_by_1",
                        "typeString": "int_const 0"
                      },
                      "value": "0"
                    },
                    "src": "489:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_bool",
                      "typeString": "bool"
                    }
                  },
                  "falseBody": null,
                  "id": 61,
                  "nodeType": "IfStatement",
                  "src": "485:36:1",
                  "trueBody": {
                    "id": 60,
                    "nodeType": "Block",
                    "src": "498:23:1",
                    "statements": [
                      {
                        "expression": {
                          "argumentTypes": null,
                          "hexValue": "30",
                          "id": 58,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": true,
                          "kind": "number",
                          "lValueRequested": false,
                          "nodeType": "Literal",
                          "src": "513:1:1",
                          "subdenomination": null,
                          "typeDescriptions": {
                            "typeIdentifier": "t_rational_0_by_1",
                            "typeString": "int_const 0"
                          },
                          "value": "0"
                        },
                        "functionReturnParameters": 54,
                        "id": 59,
                        "nodeType": "Return",
                        "src": "506:8:1"
                      }
                    ]
                  }
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 66,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftHandSide": {
                      "argumentTypes": null,
                      "id": 62,
                      "name": "c",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 53,
                      "src": "527:1:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "Assignment",
                    "operator": "=",
                    "rightHandSide": {
                      "argumentTypes": null,
                      "commonType": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "id": 65,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": false,
                      "lValueRequested": false,
                      "leftExpression": {
                        "argumentTypes": null,
                        "id": 63,
                        "name": "_a",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 48,
                        "src": "531:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "nodeType": "BinaryOperation",
                      "operator": "*",
                      "rightExpression": {
                        "argumentTypes": null,
                        "id": 64,
                        "name": "_b",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 50,
                        "src": "536:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "src": "531:7:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "527:11:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "id": 67,
                  "nodeType": "ExpressionStatement",
                  "src": "527:11:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "arguments": [
                      {
                        "argumentTypes": null,
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 73,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "argumentTypes": null,
                          "commonType": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          },
                          "id": 71,
                          "isConstant": false,
                          "isLValue": false,
                          "isPure": false,
                          "lValueRequested": false,
                          "leftExpression": {
                            "argumentTypes": null,
                            "id": 69,
                            "name": "c",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 53,
                            "src": "551:1:1",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "nodeType": "BinaryOperation",
                          "operator": "/",
                          "rightExpression": {
                            "argumentTypes": null,
                            "id": 70,
                            "name": "_a",
                            "nodeType": "Identifier",
                            "overloadedDeclarations": [],
                            "referencedDeclaration": 48,
                            "src": "555:2:1",
                            "typeDescriptions": {
                              "typeIdentifier": "t_uint256",
                              "typeString": "uint256"
                            }
                          },
                          "src": "551:6:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": "==",
                        "rightExpression": {
                          "argumentTypes": null,
                          "id": 72,
                          "name": "_b",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 50,
                          "src": "561:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "src": "551:12:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      ],
                      "id": 68,
                      "name": "assert",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 560,
                      "src": "544:6:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$",
                        "typeString": "function (bool) pure"
                      }
                    },
                    "id": 74,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "544:20:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_tuple$__$",
                      "typeString": "tuple()"
                    }
                  },
                  "id": 75,
                  "nodeType": "ExpressionStatement",
                  "src": "544:20:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 76,
                    "name": "c",
                    "nodeType": "Identifier",
                    "overloadedDeclarations": [],
                    "referencedDeclaration": 53,
                    "src": "577:1:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 54,
                  "id": 77,
                  "nodeType": "Return",
                  "src": "570:8:1"
                }
              ]
            },
            "documentation": "@dev Multiplies two numbers, throws on overflow.",
            "id": 79,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "mul",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 51,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 48,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 79,
                  "src": "216:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 47,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "216:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 50,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 79,
                  "src": "228:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 49,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "228:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "215:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 54,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 53,
                  "name": "c",
                  "nodeType": "VariableDeclaration",
                  "scope": 79,
                  "src": "263:9:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 52,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "263:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "262:11:1"
            },
            "scope": 138,
            "src": "203:380:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 92,
              "nodeType": "Block",
              "src": "734:214:1",
              "statements": [
                {
                  "expression": {
                    "argumentTypes": null,
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 90,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "argumentTypes": null,
                      "id": 88,
                      "name": "_a",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 81,
                      "src": "936:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "/",
                    "rightExpression": {
                      "argumentTypes": null,
                      "id": 89,
                      "name": "_b",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 83,
                      "src": "941:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "936:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 87,
                  "id": 91,
                  "nodeType": "Return",
                  "src": "929:14:1"
                }
              ]
            },
            "documentation": "@dev Integer division of two numbers, truncating the quotient.",
            "id": 93,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "div",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 84,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 81,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 93,
                  "src": "678:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 80,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "678:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 83,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 93,
                  "src": "690:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 82,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "690:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "677:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 87,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 86,
                  "name": "",
                  "nodeType": "VariableDeclaration",
                  "scope": 93,
                  "src": "725:7:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 85,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "725:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "724:9:1"
            },
            "scope": 138,
            "src": "665:283:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 112,
              "nodeType": "Block",
              "src": "1129:47:1",
              "statements": [
                {
                  "expression": {
                    "argumentTypes": null,
                    "arguments": [
                      {
                        "argumentTypes": null,
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 105,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "argumentTypes": null,
                          "id": 103,
                          "name": "_b",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 97,
                          "src": "1142:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": "<=",
                        "rightExpression": {
                          "argumentTypes": null,
                          "id": 104,
                          "name": "_a",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 95,
                          "src": "1148:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "src": "1142:8:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      ],
                      "id": 102,
                      "name": "assert",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 560,
                      "src": "1135:6:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$",
                        "typeString": "function (bool) pure"
                      }
                    },
                    "id": 106,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1135:16:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_tuple$__$",
                      "typeString": "tuple()"
                    }
                  },
                  "id": 107,
                  "nodeType": "ExpressionStatement",
                  "src": "1135:16:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "commonType": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    },
                    "id": 110,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftExpression": {
                      "argumentTypes": null,
                      "id": 108,
                      "name": "_a",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 95,
                      "src": "1164:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "BinaryOperation",
                    "operator": "-",
                    "rightExpression": {
                      "argumentTypes": null,
                      "id": 109,
                      "name": "_b",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 97,
                      "src": "1169:2:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "1164:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 101,
                  "id": 111,
                  "nodeType": "Return",
                  "src": "1157:14:1"
                }
              ]
            },
            "documentation": "@dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).",
            "id": 113,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "sub",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 98,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 95,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 113,
                  "src": "1073:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 94,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1073:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 97,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 113,
                  "src": "1085:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 96,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1085:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1072:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 101,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 100,
                  "name": "",
                  "nodeType": "VariableDeclaration",
                  "scope": 113,
                  "src": "1120:7:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 99,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1120:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1119:9:1"
            },
            "scope": 138,
            "src": "1060:116:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          },
          {
            "body": {
              "id": 136,
              "nodeType": "Block",
              "src": "1309:57:1",
              "statements": [
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 126,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "lValueRequested": false,
                    "leftHandSide": {
                      "argumentTypes": null,
                      "id": 122,
                      "name": "c",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 120,
                      "src": "1315:1:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "nodeType": "Assignment",
                    "operator": "=",
                    "rightHandSide": {
                      "argumentTypes": null,
                      "commonType": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      },
                      "id": 125,
                      "isConstant": false,
                      "isLValue": false,
                      "isPure": false,
                      "lValueRequested": false,
                      "leftExpression": {
                        "argumentTypes": null,
                        "id": 123,
                        "name": "_a",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 115,
                        "src": "1319:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "nodeType": "BinaryOperation",
                      "operator": "+",
                      "rightExpression": {
                        "argumentTypes": null,
                        "id": 124,
                        "name": "_b",
                        "nodeType": "Identifier",
                        "overloadedDeclarations": [],
                        "referencedDeclaration": 117,
                        "src": "1324:2:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        }
                      },
                      "src": "1319:7:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_uint256",
                        "typeString": "uint256"
                      }
                    },
                    "src": "1315:11:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "id": 127,
                  "nodeType": "ExpressionStatement",
                  "src": "1315:11:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "arguments": [
                      {
                        "argumentTypes": null,
                        "commonType": {
                          "typeIdentifier": "t_uint256",
                          "typeString": "uint256"
                        },
                        "id": 131,
                        "isConstant": false,
                        "isLValue": false,
                        "isPure": false,
                        "lValueRequested": false,
                        "leftExpression": {
                          "argumentTypes": null,
                          "id": 129,
                          "name": "c",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 120,
                          "src": "1339:1:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "nodeType": "BinaryOperation",
                        "operator": ">=",
                        "rightExpression": {
                          "argumentTypes": null,
                          "id": 130,
                          "name": "_a",
                          "nodeType": "Identifier",
                          "overloadedDeclarations": [],
                          "referencedDeclaration": 115,
                          "src": "1344:2:1",
                          "typeDescriptions": {
                            "typeIdentifier": "t_uint256",
                            "typeString": "uint256"
                          }
                        },
                        "src": "1339:7:1",
                        "typeDescriptions": {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      }
                    ],
                    "expression": {
                      "argumentTypes": [
                        {
                          "typeIdentifier": "t_bool",
                          "typeString": "bool"
                        }
                      ],
                      "id": 128,
                      "name": "assert",
                      "nodeType": "Identifier",
                      "overloadedDeclarations": [],
                      "referencedDeclaration": 560,
                      "src": "1332:6:1",
                      "typeDescriptions": {
                        "typeIdentifier": "t_function_assert_pure$_t_bool_$returns$__$",
                        "typeString": "function (bool) pure"
                      }
                    },
                    "id": 132,
                    "isConstant": false,
                    "isLValue": false,
                    "isPure": false,
                    "kind": "functionCall",
                    "lValueRequested": false,
                    "names": [],
                    "nodeType": "FunctionCall",
                    "src": "1332:15:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_tuple$__$",
                      "typeString": "tuple()"
                    }
                  },
                  "id": 133,
                  "nodeType": "ExpressionStatement",
                  "src": "1332:15:1"
                },
                {
                  "expression": {
                    "argumentTypes": null,
                    "id": 134,
                    "name": "c",
                    "nodeType": "Identifier",
                    "overloadedDeclarations": [],
                    "referencedDeclaration": 120,
                    "src": "1360:1:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "functionReturnParameters": 121,
                  "id": 135,
                  "nodeType": "Return",
                  "src": "1353:8:1"
                }
              ]
            },
            "documentation": "@dev Adds two numbers, throws on overflow.",
            "id": 137,
            "implemented": true,
            "isConstructor": false,
            "isDeclaredConst": true,
            "modifiers": [],
            "name": "add",
            "nodeType": "FunctionDefinition",
            "parameters": {
              "id": 118,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 115,
                  "name": "_a",
                  "nodeType": "VariableDeclaration",
                  "scope": 137,
                  "src": "1251:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 114,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1251:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                },
                {
                  "constant": false,
                  "id": 117,
                  "name": "_b",
                  "nodeType": "VariableDeclaration",
                  "scope": 137,
                  "src": "1263:10:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 116,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1263:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1250:24:1"
            },
            "payable": false,
            "returnParameters": {
              "id": 121,
              "nodeType": "ParameterList",
              "parameters": [
                {
                  "constant": false,
                  "id": 120,
                  "name": "c",
                  "nodeType": "VariableDeclaration",
                  "scope": 137,
                  "src": "1298:9:1",
                  "stateVariable": false,
                  "storageLocation": "default",
                  "typeDescriptions": {
                    "typeIdentifier": "t_uint256",
                    "typeString": "uint256"
                  },
                  "typeName": {
                    "id": 119,
                    "name": "uint256",
                    "nodeType": "ElementaryTypeName",
                    "src": "1298:7:1",
                    "typeDescriptions": {
                      "typeIdentifier": "t_uint256",
                      "typeString": "uint256"
                    }
                  },
                  "value": null,
                  "visibility": "internal"
                }
              ],
              "src": "1297:11:1"
            },
            "scope": 138,
            "src": "1238:128:1",
            "stateMutability": "pure",
            "superFunction": null,
            "visibility": "internal"
          }
        ],
        "scope": 139,
        "src": "117:1251:1"
      }
    ],
    "src": "0:1369:1"
  },
  "compiler": {
    "name": "solc",
    "version": "0.4.25+commit.59dbf8f1.Emscripten.clang"
  },
  "networks": {},
  "schemaVersion": "2.0.2",
  "updatedAt": "2020-03-16T03:58:56.139Z"
}