#include<stdio.h>
#include<string.h>
#include<math.h>
#define use _CRT_SECURE_NO_WARNINGS
int main()
{
	int a[1000];
	int n, temp = 0;
	float sum = 0.00;
	scanf("%d", &n);
	if (n < 3)
	{
		printf("0");
		return 0;
	}
	for (int i = 0;i < n;i++)
		scanf("%d", &a[i]);
	for (int i = 0;i < n;i++)
	{
		for (int j = 0;j < i - 1;j++)
		{
			if (a[j] > a[j + 1])
			{
				temp = a[j + 1];
				a[j + 1] = a[j];
				a[j] = temp;
			}
		}
	}
	for (int i = 1;i < n - 1;i++)
		sum += a[i];
	printf("%.2f", sum / (n - 2));
	return 0;
}