#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i,s=0,x=0,h=0,a[15]={0};
	cin>>n;
	for(i=0;i<n;i++){
		cin>>a[i];
		h=h+a[i];
	}
	x=a[0];
	s=0;
	for(i=0;i<n;i++){
	    if(a[i]<x){
	    	x=a[i];
	    }
	    if(a[i]>s){
	    	s=a[i];
	    }
	}
	printf("%,2f",(h-x-s)*1.0/(n-2));
}
/**************************************************************
	Problem: 1168
	User: huanghengyi
	Language: C++
	Result: Wrong Answer
****************************************************************/