#include <stdio.h>
int Max3(int a, int b, int c)
{
int max = a > b ? a : b;
return max > c ? max : c;
}
int main()
{
int a = 0;
int b = 0;
int c = 0;
scanf("%d %d %d", &a, &b, &c);
float m = (float)Max3(a + b, b, c) / (Max3(a, b + c, c) + Max3(a, b, b + c));
printf("%.2f\n", m);
return 0;
} 
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