#include <iostream>
using namespace std;
int main(){
	int n,a[1001],ma = -1,mi = 11,s;
	cin >> n;
	for(int i = 1;i <= n;i++){
		cin >> a[i];
		s += a[i];
		if(a[i] > ma) ma = a[i];
		if(a[i] < mi) mi = a[i];
	}
	printf("%.2lf",(s - ma - mi) / (n - 2.0));
	return 0;
}