#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;
      
    printf("%.2f",sum/n);
    return 0;
}
/**************************************************************
	Problem: 1168
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/