#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int p=n;
    float ans=0,maxn=-1,minn=100;
    while(n--){
        float x;cin>>x;ans+=x;
        maxn=max(x,maxn),minn=min(x,minn);//求最大最小
    }
    printf("%.2f",(ans-maxn-minn)/(p-2.0));
    return 0;
}