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

/**************************************************************
	Problem: 1168
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2076 kb
****************************************************************/