#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,i,max=0,min=0,m=0;
	float q=0;
	cin>>n;
	int a[n];
	for(i=0;i<=n-1;i++){
		cin>>a[i];
		m+=a[i];
	}max=a[0]; min=a[0];
	for(i=0;i<=n-1;i++){
		if(max<a[i]) max=a[i];
		if(min>a[i]) min=a[i];
	}m=m-max-min;
	q=m*1.0/(n-2);
	printf("%.2f",q);
	return 0;
}

/**************************************************************
	Problem: 1168
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/