#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<double> v(n);
  for (auto& e : v) cin >> e;
  double ave = 0;
  for (auto& e : v) ave += e;
  ave = ave / n;
  int argi = 0;
  for (int i = 0; i < n; ++i) {
    if (abs(v[i] - ave) < abs(v[argi] - ave)) i = argi;
  }
  cout << argi << endl;
}
