#include <bits/stdc++.h>
using namespace std;
int main(){
    int a[15]={0},m=0,n,x,d,e=0;
    cin>>n;
    for(m=0;m<n;m++){
    	cin>>a[m];
    	e=e+a[m];
    }
    x=a[0];
    d=a[0];
    for(m=0;m<n;m++){
    	if(d<a[m]){
    		d=a[m];
    	}
    	if(x>a[m]){
    		x=a[m];
    	}
    }
    e=e-x-d;
    n=n-2;
    printf("%.2f",e/1.0/n);
}

/**************************************************************
	Problem: 1168
	User: lvrenxiang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/