#include<bits/stdc++.h>
using namespace std;
int main(){
    int  c[10]={0},n=0,d,i=0,x,p=0;
    cin>>n;
    for(i=0;i<n;i++){
        cin>>c[i];
        p=p+c[i];
    }
    x=c[0];
    d=0;
    for(int i=0;i<n;i++){
        if(c[i]<x){
            x=c[i];
        }
        if(c[i]>d){
            d=c[i];
        }
         
     
    }
        printf("%.2f",(p-x-d)*1.0/(n-2)); 
}
/**************************************************************
	Problem: 1168
	User: wenda
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/