#include<bits/stdc++.h>
using namespace std;
int n,a[30],mx=INT_MIN,mn=INT_MAX,s;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		s=s+a[i];
		if(a[i]>mx) mx=a[i];
		if(a[i]<mn) mn=a[i];
	}
	printf("%.2f",(s-mx-mn)*1.0/(n-2));
		
	return 0;	
	
}
/**************************************************************
	Problem: 1168
	User: dengyuanyan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/