#include <stdio.h> int max3(int x, int y, int z) { int max = x; if (x <= y) { max = y; if (y <= z) { max = z; } } else { if (x <= z) max = z; } return max; } int main() { int a = 0; int b = 0; int c = 0; scanf("%d%d%d", &a, &b, &c); double m = max3(a + b, b, c) / (max3(a, b + c, c) + max3(a, b, b + c) * 1.0); printf("%.2lf\n", m); return 0; }