#include <iostream> using namespace std; int n, sum; int main() { cin >> n; int a[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]) ++sum; cout << sum; return 0; }