#include <algorithm>
#include <iostream>
#include <string>
#include <random>
#include <cassert>
#include <cstring>
#include <chrono>
#include <set>
#include <map>

using namespace std;

typedef long long ll;

int main()
{
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; ++i) cin >> a[i];
  int s = accumulate(a.begin(), a.end(), 0);
  int best = 1 << 30;
  int bestI = -1;
  for (int i = 0; i < n; ++i) {
    int x = a[i];
    int cur = abs(x * n - s);
    if (cur < best) {
      best = cur;
      bestI = i;
    }
  }
  cout << bestI << endl;
  return 0;
}

#include <algorithm>
#include <bitset>
#include <tuple>
#include <cstdint>
#include <cstdio>
#include <cctype>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <ctime>
#include <deque>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <limits>
#include <map>
#include <memory>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>
#define ArraySizeOf(array)     (sizeof(array) / sizeof(array[0]))
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define REP(i,n) for(int i=1;i<n;i++)
#define rev(i,n) for(int i=n-1;i>=0;i--)
#define REV(i,n) for(int i=n-1;i>0;i--)
#define req(i,n,m) for(int i=n;i<m;i++)
#define REQ(i,n,m,l) for(int i=n;i<m;i+=l) 
#define _GLIBCXX_DEBUG
int INF = 1e9 + 7;
unsigned NthDayOfWeekToDay(unsigned n, unsigned dow, unsigned dow1)
{
    unsigned day;
    if (dow < dow1) dow += 7;
    day = dow - dow1;
    day += 7 * n - 6;
    return day;
}
signed gcd(int x, int y) {
    if (y == 0)return x;
    return gcd(y, x % y);
}
signed lcm(int x, int y) {
    return x / gcd(x, y) * y;
}
unsigned DayToWeekNumber(unsigned day)
{
    return (day - 1) / 7 + 1;
}
unsigned AnotherDayOfWeek(unsigned day, unsigned day0, unsigned dow0)
{
    return (dow0 + 35 + day - day0) % 7;
}
using namespace std;
signed main() {
    int N; cin >> N;
    vector<double>a(N);
    long double count = 0;
    rep(i, N) {
        cin >> a[i];
        count += a[i];
    }
    vector<long double>b(N);
    rep(i, N)b[i] = abs(a[i] - count/N);
    sort(b.begin(), b.end());
    double ans1 = abs(b[0] - count / N);
    double ans2 = b[0] + count / N;
    rep(i, N) {
        if (a[i]==ans1 || a[i]==ans2) {
            cout << i << endl;
            return 0;
        }
    }
}