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