#include <stdio.h>
int main()
{
	int n = 0;
	scanf("%d", &n);
	int num[] = { 0 };
	int i = 0;
	double sum = 0.0;
	int max, min;
	for (int i = 0;i < n;i++)
	{
		scanf("%d", &num[i]);
		sum += num[i];
	}
	max = min = num[0];
	for (int i = 0;i < n;i++)
	{
		if (num[i] > max)
		{
			max = num[i];
		}
		if (num[i] < min)
		{
			min = num[i];
		}
	}
	sum = (sum-max-min) / (n-2);
	printf("%.2llf\n",sum);
	return 0;
}