#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];
  }
  double ave = accumulate(a.begin(), a.end(), 0) / a.size();
  int temp = a[0];
  int ans = 0;
  for (int i = 0; i < N; i++) {
    if (abs(ave - a[i]) < temp) {
      temp = abs(ave - a[i]);
      ans = i;
    }
  }
  cout << ans << endl;
}
