#include <bits/stdc++.h>
using namespace std;
int N;
int a[10000000];
int main() {
  cin >> N;
  int num = 0;
  for (int i = 0; i < N; i++) {
    cin >> a[i];
    num += a[i];
  }
  int ans = 0;
  double n = 100;
  double avarage = (double)num / (double)N;
  for (int i = 0; i < N; i++) {
    if (n > abs(a[i] - avarage)) {
      ans = i;
      n = abs(a[i] - avarage);
    }
  }
  cout << ans << endl;
}
