#include <stdio.h>

int main()
{
    int sum = 0;
    int min = 100; //假设最低分为100
    int max = 0; //假设最高分为0
    int arr[7] = { 0 };
    //整型数组输入
    for (int i = 0; i < 7; i++)
    {
        scanf("%d", &arr[i]);
        if (arr[i] > max)
        {
            max = arr[i];
        }
        if (arr[i] < min)
        {
            min = arr[i];
        }
        sum += arr[i];
    }
    double avg = (sum - max - min) / 5.0;
    //输出
    printf("%.2lf\n", avg);

    return 0;
}