#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  int ave = 0;
  for (int i = 0; i < n; i++) ave += a[i];
  ave /= n;
  int ans = 0;
  int num = abs(n * ave - n * a[0]);
  for (int i = 1; i < n; i++) {
    if (num > abs(n * ave - n * a[i])) {
      ans = i;
      num = abs(n * ave - n * a[i]);
    }
  }
  cout << ans << endl;
  return 0;
}
