using System;

public class Program

{

    public static void Main()

    {

        int num;

        Console.WriteLine("Enter a start number:");

        num = Convert.ToInt32(Console.ReadLine());

        //Console.Clear();

        bool loop = true;

        while(loop)

        {

            Console.Write(num + " | ");

            switch(num % 2)

            {

                case 0:

                    num /= 2;

                    break;

                case 1:

                    if(num == 1)

                    {

                        loop = false;

                    }

                    else

                    {

                        num = (num * 3) + 1;

                    }

                    break;

            }

        }

    }

}