#include<bits/stdc++.h>
using namespace std;
int main()
{	
	int n,max,min;
	float sum=0;
	cin>>n; 
	
	int a[n];
	for(int i=0;i<n;i++){
		cin>>a[i];
		sum+=a[i];
		if(i==0){
			max=a[i];
			min=a[i];
		}else{
			if(max<a[i])max=a[i];
			if(min>a[i])min=a[i];
		}
	}
	sum-=max;
	sum-=min;
	
	n-=2;//人数
	
	printf("%.2f",sum/n);


	return 0;
}

/**************************************************************
	Problem: 1168
	User: hbq
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/