#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	int a[100],mx=INT_MIN,mn=INT_MAX,x=0;
    for(int i=1;i<=n;i++){
        cin>>a[i];
        x=x+a[i];
        if(a[i]>mx)mx=a[i];    
        if(a[i]<mn)mn=a[i];
	
    }
    //cout<<mx<<" "<<mn; 
	printf("%.2f",(x-mn-mx)*1.0/(n-2));    
	return 0;
}

/**************************************************************
	Problem: 1168
	User: lidongbo
	Language: C++
	Result: Accepted
	Time:28 ms
	Memory:2072 kb
****************************************************************/