#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  int sum = 0;
  for (int i = 0; i < n; i++) {
    sum = sum + a[i];
  }
  double mean = sum / n;
  int margin = abs(mean - a[0]);
  int top = 0;
  for (int i = 0; i < n; i++) {
    if (margin > abs(mean - a[i])) {
      top = i;
      margin = abs(mean - a[i]);
    }
  }
  cout << top;
}
