文件目录

#include <iostream>
using namespace std;
double max(double a, double b, double c)
{
    if (a < b)
        swap(a, b);
    if (a < c)
        swap(a, c);
    return a;
}
int main()
{
    double a, b, c;
    cin >> a >> b >> c;
    double m = max(a, b, c) / (max(a + b, b, c) * max(a, b, b + c));
    printf("%.3lf", m);
    return 0;
}