#include<iostream>
#include<iomanip>
using namespace std;

int n;
double* a = new double[n];
double minn = 10;
double maxx = 0;
double sum =0;

int main()
{
	cin >> n;

	for (int i = 0; i < n; i++)
	{
		cin >> a[i];
		sum += a[i];
		if (minn > a[i])
		{
			minn = a[i];
		}
		if (maxx < a[i])
		{
			maxx = a[i];
		}
	}
	double p = sum - minn - maxx;
	int m = n - 2;
	cout << fixed << setprecision(2) << p / m;
}