#include <bits/stdc++.h>
using namespace std;
int main(){
    int max,min,h=0,a[10],n;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
		h+=a[i];
	}
	max=a[0];
	min=a[0];
	for(int i=1;i<n;i++){
		if(max<a[i]) max=a[i];
		if(min>a[i]) min=a[i];
	} 
	printf("%.2f",(h-(max+min))*1.0/(n-2));
}
/**************************************************************
	Problem: 1168
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/