#include <stdio.h>
int main()
{
int a[7];
while(scanf("%d",&a[0])!=EOF)
{
int max=a[0],mine=a[0],sum=a[0];
float average=0;
for(int i=1;i<7;i++)
{
scanf("%d",&a[i]);
if(a[i]>max)
{
max=a[i];
}
if(a[i]<mine)
{
mine=a[i];
}
sum+=a[i];
}
sum=sum-max-mine;
average=sum/5.0;
printf("%.2f\n",average);
}
return 0;
}

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