using System;

​

public class Program

{

    public static void Main()

    {

        printChristmasTree(10);

    }

​

    public static void printStars(int amount)

    {

        for (var i = 0; i < amount; i++)

        {

            Console.Write("*");

        }

​

        Console.WriteLine("");

    }

​

    public static void printSpaces(int amount)

    {

        for (var i = 0; i < amount; i++)

        {

            Console.Write(" ");

        }

    }

​

    public static void printChristmasTree(int size)

    {

        int amountOfStars = 1;

        for (var i = 0; i < size; i++)

        {

            if (i > 0)

            {

                amountOfStars += 2;

            }

​

            printSpaces(size - (i + 1));

            printStars(amountOfStars);

        }

​

        for (var i = 0; i < 2; i++)

        {

            printSpaces(size - 2);

            printStars(3);

        }

    }

}