#include <bits/stdc++.h>
using namespace std;
int main() {
  long N, a[100000];
  cin >> N;
  long total = 0;
  for (int i = 0; i < N; i++) {
    cin >> a[i];
    total += a[i];
  }
  double avg = total / N;
  long min = 100;
  int ans;
  for (int i = N - 1; i >= 0; i--) {
    if (abs(a[i] - avg) <= min) {
      ans = i;
      min = abs(a[i] - avg);
    }
  }
  cout << ans << endl;
}
