using System;

public class Program

{

    public static void Main()

    {

         int Qadr_Night_Number;

​

            Console.WriteLine("Enter the night number of Ramadan");

            Qadr_Night_Number = int.Parse(Console.ReadLine ());

​

            if (Qadr_Night_Number < 1 || Qadr_Night_Number > 30)          

            {

                Console.WriteLine("Error in Data !!!");

            }

            else

            {

                if (Qadr_Night_Number > 0 && Qadr_Night_Number <= 20)

                {

                    Console.WriteLine("This is not Qadr night");

                }

                else

                {

                    if (Qadr_Night_Number <= 30 && Qadr_Night_Number % 2 == 1)

                    {

                        Console.WriteLine("This is Qadr night");

                    }

                    else

                    {

                        Console.WriteLine("This is not Qadr night");

                    }

                }

            }

    }

}