using System;

public class Program

{

    public static void Main()

    {

        var levels = 7;

        var charactersPerLine = levels * 2 - 1;

        var spaces = charactersPerLine / 2;

        var stars = 1;

        for (int i = 0; i < levels; i++)

        {

            Console.WriteLine(new string(' ', spaces) + new string('*', stars) + new string(' ', spaces));

            --spaces;

            stars += 2;

        }

    }

}