using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello Pearl ! \nEnter Number of Rows");

        int row = Convert.ToInt32(Console.ReadLine());

        int size = (row * 2 ) -1;

        int range = row - 1;

        int flag = (range * -1);

        Console.WriteLine(size);        

        for(int j = 1;j<=size;j++)      

        {

            for(int i = -(range);i<=range;i++)

            {

                int print = Math.Abs(i) + 1;

                int max =  Math.Abs(flag) + 1;

                if(max > print)

                    print = max;    

                Console.Write(print.ToString("0") + " ");

            }

            flag++;

            Console.WriteLine("");

        }

    }

}