#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a[100],mx=INT_MIN,mn=INT_MAX,s=0;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		s=s+a[i];
	}
	
	//for(int i=1;i<=n;i++) cout<<a[i]<<" ";
	//cout<<s<<endl;
	for(int i=1;i<=n;i++){
		if(mx<a[i]) mx=a[i];
		if(a[i]<mn) mn=a[i];
	}
	//cout<<mx<<" "<<mn;
//	cout<<s-mn-mx;
	printf("%.2f",(s-mn-mx)*1.0/(n-2)); 
	
	
	
	
	
	
	
	
	
}
/**************************************************************
	Problem: 1168
	User: lidongcheng
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/