#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[12]={0},n,i,max=0,min=0;
	float h=0;
	cin>>n;
	for(i=0;i<n;i++){
		cin>>a[i];
		h=h+a[i];
    }
    min=a[0];
    for(i=0;i<n;i++){
    	if(max<a[i]){
    		max=a[i];
    	}
    	if(min>a[i]){
    		min=a[i];
    	}
    }
    h=h-min-max;
    h=h/(n-2);
    printf("%.2f",h);
}  
/**************************************************************
	Problem: 1168
	User: fandaohan
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/