#include<bits/stdc++.h>
using namespace std;
int main(){
    int a[10]={0},d=0,x=0,n,h=0;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>a[i];
        h=h+a[i]; 
    }
    d=0;
    x=a[0];
    for(int i=0;i<n;i++){
        if(a[i]<x){
            x=a[i];
        }
        if(a[i]>d){
            d=a[i];
        }
    }
    printf("%.2f",(h-x-d)*1.0/(n-2));
     
}
/**************************************************************
	Problem: 1168
	User: huanghengyi
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/