#include <stdio.h>
int main()
{
int score = 0, max = 0, min = 100, sum = 0, count = 0;
while (scanf("%d", &score) != EOF)
{
if (score > max)
max = score;
if (score < min)
min = score;
sum += score;
count++;
if (count == 7)
{
printf("%.2f\n", (sum - max - min) / 5.0);
max = 0, min = 100, sum = 0, count = 0;
}
}
return 0;
}

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