using System;

public class Program

{

    public static void Main()

    {

        int i=20;

        //Console.WriteLine("Enter a number");

        //no=int.Parse(Console.ReadLine());

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

        while(i>=1)

        {

            //Console.WriteLine(no+1-i);

            //Console.WriteLine(i+=2);

            if(i%2!=0)

            {

                Console.WriteLine(i);

            }

            i--;

        }

    }

}