#include <iostream> using namespace std; int n, a[100010], ans; int main() { cin >> n; for (int i = 1; i <= n; i++) cin >> a[i]; for (int i = 1; i <= n; i++) for (int j = 1; j < i; j++) if (a[i] < a[j]) ans++; cout << ans << endl; return 0; }