Rectangle

using System;
class Program
{
    static void Main(string[] args)
    {
        int n = int.Parse(Console.ReadLine());
        int[][] num = new int[n][];
        for (int i = 0; i < num.Length; i++)
        {
            num[i] = new int[i+1];
        }
        for (int i = 0; i < n; i++)
        {
            for (int k = 0; k < num[i].Length; k++)
            {
                Console.Write(num[i][k]);
            }
            Console.WriteLine();
        }
    }
}