#include<cstdio>
#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{	int king[1001];
	int n,sum,max,min,num;
	double point;
	cin>>n;
	for (int i=1;i<=n;i++)
	  {
	  	cin >> king[i];
	  	if (king[i]>max) max=king[i];
	  	if (king[i]<min) min=king[i];
	  }
	  
	for (int i=1;i<=n;i++)
	sum=sum+king[i];
	
	sum=sum-min-max;
	point=sum/(n-2);
	printf("%3.2f",point);
	return 0;
}