using System;

public class Program

{

    static double max(double a, double b) 

    {

        return (a>b)? a: b;

    }

​

    public static void Main(string[] args)

    {

        string a1 = Console.ReadLine();

        int a = Convert.ToInt32(a1);

        string b1 = Console.ReadLine();

        int b = Convert.ToInt32(b1);

            string c1 = Console.ReadLine();

        int c = Convert.ToInt32(c1);

        double S = (max(a, a+b) + max(a,b+c))/(1 + max(a+b*c, 1.15));

        Console.WriteLine(S);

​

    }  

}