#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: yangjunwen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/