#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	double g=0,s=0,f=0;
	cin>>n;
	int a[n];
	for(int i=0;i<n;i++){
		cin>>a[i];
		f+=a[i];
	}
	g=a[0];
	s=a[0];
	for(int j=1;j<n;j++){
		if(a[j]>g){
			g=a[j];
		}
		if(a[j]<s){
			s=a[j];
		}
	}
	f=f-g-s;
	f=f/(n-2);
	printf("%.2f",f);

}

/**************************************************************
	Problem: 1168
	User: wuzhijing
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/