#include <stdio.h>
int main()
{
float stl[5];
int i = 0;
float average, sum = 0.0;
for (i = 0; i < 5; i++)
{
scanf("%f", &stl[i]);
sum += stl[i];
}
average = sum / 5;
printf("%.2f\n", average);
return 0;
}

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