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