using System;

​

public class Program

{

    public static void Main()

    {

        int count = 1; 

        bool ImpairCount;

        bool PairCount;

        while (count <= 20)

        {

            PairCount = ( count % 2 == 0  );

            // if (count % 2 != 0)  

            ImpairCount= ( !PairCount )     ;

            // Impair= (! (count % 2 == 0) )  ;

            if ( ImpairCount ) 

            {

                Console.WriteLine(" Count DV :"+count);  

            }

            count = count + 1;

        }   

    }

}

​