#include<stdio.h>
int main()
{
int arr[10]={0};
int i = 0;
while (~scanf("%d %d %d %d %d %d %d", &arr[0], &arr[1], &arr[2], &arr[3], &arr[4], &arr[5], &arr[6]))
{
for(i=0;i<7;i++)
{
if(arr[i]>arr[0])
{
int ret = arr[i];
arr[i]=arr[0];
arr[0]=ret;
}
if(arr[i]<arr[1])
{
int ret = arr[i];
arr[i]=arr[1];
arr[1]=ret;
}
}
float grade =0.0;
int sum = 0;
for(i = 2;i<7;i++)
{
sum +=arr[i];
}
grade = sum/5.0;
printf("%.2f\n",grade);
}
return 0;
}

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