#include <bits/stdc++.h>
using namespace std;
int n,pi,x,maxn=-1,minn=100;
int main() {
	float tot;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>x;
		if(x>maxn) maxn=x;
		if(x<minn) minn=x;
		pi+=x;
	}
	tot=pi-maxn-minn;
	printf("%.2 f",tot/(n-2));
    return 0;
}