HDU 4520

#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#define LL __int64

using namespace std;
const int N=25;
struct Judger{
    double score;
    int num;
    bool operator <(const Judger &a)const {
        if(score<a.score) return true;
        return false;
    }
}p[N];
int n;

int main(){
    while(scanf("%d",&n),n){
        for(int i=0;i<n;i++){
            scanf("%lf",&p[i].score);
            p[i].num=1+i;
        }
        sort(p,p+n);
        double sum=0;
        for(int i=1;i<n-1;i++)
        sum+=p[i].score;
        double px=sum/(n-2);
        int ans=0;
        for(int i=1;i<n;i++){
            if(fabs(p[i].score-px)<fabs(p[ans].score-px)){
                ans=i;
            }
            else if(fabs(p[i].score-px)==fabs(p[ans].score-px)){
                if(p[ans].num>p[i].num)
                ans=i;
            }
        }
        printf("%d\n",p[ans].num);
        
    }
    return 0;
}