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