#include <stdio.h>
int max3(int a, int b, int c)
{
int max = a;
if (b > max)
max = b;
if (c > max)
max = c;
return max;
}
int main()
{
int a = 0;
int b = 0;
int c = 0;
while (scanf("%d %d %d", &a, &b, &c) == 3)
{
float m = 0;
m = max3(a + b, b, c) * 1.0 /(max3(a, b + c, c) + max3(a, b, b + c));
printf("%.2f\n", m);
}
return 0;
}

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