#include<iostream>
#include<algorithm>
using namespace std;
int main(){
	int n,minn,maxn;
	cin>>n;
	double ans=0;
	int a[1200]={0};//已经比题目给的范围多了200，应该够了. 
	for(int i=1;i<=n;i++){
		cin>>a[i];
		if(a[i]<a[i-1]){
			minn=a[i];
		}
		if(a[i]>a[i-1]){
			maxn=a[i];
		}
	}
	for(int i=0;i<=n;i++){
		ans=ans+a[i];
	}
	ans=ans-maxn-minn;
	ans=ans/(n-2);
	printf("%.2f",ans);
	return 0;
}