#include <iostream>

inline int _(int & _) {
    char ch = getchar();
    bool bol = false;
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    if(ch == '-') {
        bol = true;
        ch = getchar();
    }
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    if(bol)
        _ = -_;
    return _;
}
inline bool _(bool & _) {
    char ch = getchar();
    while('0' > ch || ch > '9')
        ch = getchar();
    _ = (ch != '0');
    return _;
}
inline long _(long & _) {
    char ch = getchar();
    bool bol = false;
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    if(ch == '-') {
        bol = true;
        ch = getchar();
    }
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    if(bol)
        _ = -_;
    return _;
}
inline short _(short & _) {
    char ch = getchar();
    bool bol = false;
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    if(ch == '-') {
        bol = true;
        ch = getchar();
    }
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    if(bol)
        _ = -_;
    return _;
}
inline float _(float & _) {
    char ch = getchar();
    bool bol = false;
    if(ch == '-') {
        bol = true;
        ch = getchar();
    }
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar()) {
        _ = _ * 10 + ch - 48;
    }
    if(ch == '.') {
        ch = getchar();
        for(register unsigned int cnt = 1; '0' <= ch && ch <= '9'; ch = getchar()) {
            cnt *= 10;
            _ += (ch - 48) * 1.0 / cnt;
        }
    }
    if(bol) {
        _ = -_;
    }
    return _;
}
inline double _(double & _) {
    char ch = getchar();
    bool bol = false;
    if(ch == '-') {
        bol = true;
        ch = getchar();
    }
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar()) {
        _ = _ * 10 + ch - 48;
    }
    if(ch == '.') {
        ch = getchar();
        for(register unsigned int cnt = 1; '0' <= ch && ch <= '9'; ch = getchar()) {
            cnt *= 10;
            _ += (ch - 48) * 1.0 / cnt;
        }
    }
    if(bol) {
        _ = -_;
    }
    return _;
}
inline long long _(long long & _) {
    char ch = getchar();
    bool bol = false;
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    if(ch == '-') {
        bol = true;
        ch = getchar();
    }
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    if(bol)
        _ = -_;
    return _;
}
inline long double _(long double & _) {
    char ch = getchar();
    bool bol = false;
    if(ch == '-') {
        bol = true;
        ch = getchar();
    }
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar()) {
        _ = _ * 10 + ch - 48;
    }
    if(ch == '.') {
        ch = getchar();
        for(register unsigned int cnt = 1; '0' <= ch && ch <= '9'; ch = getchar()) {
            cnt *= 10;
            _ += (ch - 48) * 1.0 / cnt;
        }
    }
    if(bol) {
        _ = -_;
    }
    return _;
}
inline std::string _(std::string & _) {
    std::getline(std::cin, _);
    return _;
}
inline unsigned int _(unsigned int & _) {
    char ch = getchar();
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    return _;
}
inline unsigned long _(unsigned long & _) {
    char ch = getchar();
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    return _;
}
inline unsigned short _(unsigned short & _) {
    char ch = getchar();
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    return _;
}
inline unsigned long long _(unsigned long long & _) {
    char ch = getchar();
    while(ch == ' ' || ch == '\n' || ch == '	')
        ch = getchar();
    for(_ = 0; '0' <= ch && ch <= '9'; ch = getchar())
        _ = _ * 10 + ch - 48;
    return _;
}

int num[2001];

int main() {
    int n, cnt = 0;
    _(n);
    for(int i = 0; i < n; i++)
        _(num[i]);
    for(int i = 0; i < n; i++) {
        for(int j = i + 1; j < n; j++) {
            if(num[j] < num[i])
                cnt++;
        }
    }
    std::cout << cnt;
    return 0;
}