//看题解基本不是用数组写的,用数组写的话不能多组输入,突然想到这样写就成了
#include<stdio.h>
int main()
{
	int arr[7] = {0};
	int i = 0, max = 0, min = 100, sum = 0;
	while (scanf("%d", &arr[i]) != EOF)
	{
		if (arr[i] > max)
			max = arr[i];
		if (arr[i] < min)
			min = arr[i];
		sum += arr[i];
		i++;
		if (i == 7)
		{
			printf("%.2f\n", (sum - max - min) / 5.0);
			i = 0, max = 0, min = 100, sum = 0;
		}
	}
	return 0;
}