#include <bits/stdc++.h>
using namespace std;

int a[10010];

int main(){
    int n, s=0;
    cin >> n;
    for(int i = 0; i <= n; i++)
        cin >> a[i];
    for (int i = 0; i <= n; ++i)
        for (int j = 0; j < i; ++j)
            if (a[j] > a[i])
                s++;
    cout << s;
    return 0;
}