using System;
using System.Linq;
public class Program
{
public static void Main()
Console.WriteLine(Plus.Pattern(9));
}
public static class Plus
public static string Pattern(int n)
return n < 1 ? "" : string.Join("\n",
Enumerable
.Range(1, n)
.Select(i => string.Join("", Enumerable.Repeat(i, i))));