Printing Triangle

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {


        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());


            for( int i = 0; i < n; i++)
            {
                PrintLine(1, i);
            }

            PrintLine(1, n);

            for(int i = n-1; i >= 0; i --)
            {
                PrintLine(1, i);
            }
        }

        static void PrintLine(int start,int end)
        {


            for(int i = start; i <= end; i++)
            {
                Console.Write(i + " ");
            }
            Console.WriteLine();


        }






    }
}