using System;

public class Program

{

    static private double leg(double b, double c)

{

double b2 = b*b;

double c2 = c*c;

return Math.Sqrt(c2-b2);

}

    public static void Main()

        {

{start:

double input1 = double.Parse(Console.ReadLine());

double input2 = double.Parse(Console.ReadLine());

double output = leg(input1, input2);

Console.WriteLine(output); 

goto start; 

} 

    }

}

​

​