using System;

​

​

namespace CollatzSequence

{

   public class Program

    {

        public static void Main(string[] args)

        {

            int num;

            int sequenceNum = 0;

​

            Console.Write("Enter a number: ");

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

​

            if (num > 0)

            {

                Console.Write("{0} ", num);

​

                while(num != 1)

                {

                    num = CollatzSequence(num);

                    Console.Write(" {0}", num);

​

                    sequenceNum++;

                }

            }

​

            Console.ReadLine();

        }

​

        static int CollatzSequence(int n)

        {

            if (n % 2 == 0)

            {

                return n / 2;

            }

            else

            {

                return 3 * n + 1;

            }

        }

    }

}