#include <iostream>
#include <cmath>
using namespace std;

int N;
int a[101];

int solve(double ave){
	int index = 0;
	for(int i=0;i<N;i++){
		if(abs(a[i]-ave) < abs(a[index]-ave)){
			index = i;
		}
	}
	cout << index << endl;
	return 0;
}

int main(){
	cin >> N;
	double ave=0;
	for(int i=0;i<N;i++){
		cin >> a[i];
		ave += a[i];
	}
	ave /= N;
	solve(ave);
	return 0;
}