using System;

public class Exercise20

{

    public static void Main()

    {

        Console.WriteLine("Input first number: ");

        int num1= Convert.ToInt32(Console.ReadLine ());

        Console.WriteLine("Input second number: ");

        int num2= Convert.ToInt32(Console.ReadLine ());

        int resta= num1 - num2;

        if (num1>num2)  Console.WriteLine (resta * 2);

        else Console.WriteLine(num2-num1);

    }

}