#include <stdio.h>
int main()
{
int n;
while (scanf("%d", &n) != EOF)
{
int max = n;
int min = n;
int sum = n;
for (int i = 1; i <= 6; i ++ )
{
int x;
scanf("%d", &x);
if (max < x) max = x;
if (min > x) min = x;
sum += x;
}
sum = sum - max - min;
double res = sum / 5.0;
printf("%.2lf\n", res);
}
return 0;
}

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