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#include <bits/stdc++.h>
using namespace std;
const int N = 10010;
int a[N];
int n, cnt;
int main() {
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i < n; i++)
for (int j = i + 1; j <= n; j++)
if (a[i] > a[j]) {
cnt++;
swap(a[i], a[j]);
}
cout << cnt << endl;
return 0;
}