using System;

public class Program

{

    public static void Main()

    {   

        Console.WriteLine("What's the first perpendicular?");

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

        Console.WriteLine("What is the second perpendicular");

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

        double df = Math.Pow(f,2);

        double   ds = Math.Pow(s,2);;

        double p=   (df+ds);

        double num = Math.Sqrt(p);

        Console.WriteLine("The vertical length is:"+ num);  

    }

}