using System;

public class Variable

{

    public static void Main()

    {

            Console.Write("จะคูณแม่อะไรใส่มา : ");   

            int insert;

            int num=1;

            int.TryParse(Console.ReadLine(),out insert);

            while (num<=12)

        {

            Console.WriteLine(insert+ "X" +num+ "=" +num*insert);

            num++;

                }

        }

    }

​