using System;

​

public class Program

{/*

    public static bool IsEven(int value)

    {

        return value % 2 == 0;

    }

​

    public static bool Divided3(int value)

    {

        return value % 3 == 0;

    }

​

    public static bool Divided4(int value)

    {

        return value % 4 == 0;

    }

​

    public static void Main()

    {

        for (int i = 0; i < 21; i++)

            if (IsEven(i))

            {

                Console.Write(i + " ");

            }

​

        Console.WriteLine("");

        for (int i = 0; i < 20; i++)

            if (Divided3(i))

            {

                Console.Write(i + " ");

            }

​

        Console.WriteLine("");

        for (int i = 0; i < 21; i++)

            if (Divided4(i))

            {

                Console.Write(i + " ");

            }

​

        Console.WriteLine("");

        Console.WriteLine("And we're done!");

*/  }

​