using System;

public class Program

{

    public static void Main()

    {

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

            int no;

            no = Convert.ToInt32(Console.ReadLine());

            int k;

            k = 0;

            for (int i = 1; i <= no; i++)

            {

                if (no % i == 0)

                {

                    k++;

                }

            }

            if (k == 2)

            {

                Console.WriteLine("Good job");

            }

            else

            {

                Console.WriteLine("sorry");

            }

            Console.ReadLine();

        }

    }

​