using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(GetSpeed(2f, 6f));

    }

        static double GetSpeed (float xMovement, float yMovement){

            double speed = 0f;

            speed = (double)Math.Sqrt(Math.Pow(xMovement, 2) + Math.Pow(yMovement, 2));

            return speed;

    }

}