#include <iostream>
using namespace std;



long p = -66666;
long q = 88888;
double a[5];
double n;

double sum;


int main() {
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		sum += a[i];


		if (a[i] > p) {
			p = a[i];
		}
		if (a[i] < q) {
			q = a[i];
		}


	}
	printf("%.2lf", (sum - (p + q)) / (n - 2) * 1.0);



	return 0;
}