Дърво

using System;

public class Program
{
    public static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        Console.Write(new string (' ',n));
        Console.WriteLine("|");
        for ( int i = 0; i <= n; i++)
        {
            Console.Write(new string(' ',n-i));
            Console.Write(new string ('*', i));
            Console.Write("|");
            Console.Write(new string ('*', i));
            Console.WriteLine(new string(' ',n-i));
        }
            Console.Write(new string(' ',n));
    }
}