#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int N, M;
  while (cin >> N, N) {
    int num[N], cnt = 0;
    fill_n(num, N, 0);
    for (int i = 0; i < N; i++) {
      cin >> num[i];
    }
    for (int i = N - 1; i > 0; i--) {
      for (int j = 1; j <= i; j++) {
        if (num[j] < num[j - 1]) {
          int tmp;
          tmp = num[j];
          num[j] = num[j - 1];
          num[j] = tmp;
          cnt++;
        }
      }
    }
    cout << cnt << endl;
  }
}
