#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin>>a;
    switch (a)
    {
        case 4:while (1);break;
        case 5:while (1) new string("23333");
        case 7:a=1/0;
        default:cout<<a;
    }
    return 0;
}