#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: chenjiahui
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/