#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  vector<int> a(n);
  double sum = 0;
  for (int i = 0; i < n; i++) cin >> a[i];
  for (int i = 0; i < n; i++) sum += a[i];
  sum /= n;
  int id = 0, dist = 100;
  for (int i = 0; i < n; i++)
    if (fabs(sum - a[i]) < dist) {
      id = i;
      dist = fabs(sum - a[i]);
    }
  cout << id << '\n';
  return 0;
}
