Choinka z gwiazdek

Choinka z gwiazdek :

            int d,i,j,n,p,k;
            string a, b;
            Console.WriteLine("Podaj wysokosc choinki: ");
            n = int.Parse(Console.ReadLine());
            a = "*";
            b = " ";
            d = n;
            for (i = 1; i <= n; i++)
            {
                for( j = 1; j < d ; j++)
                {
                    Console.Write(b);
                }              
                for (p = 1; p <= i; p++)
                {
                    Console.Write(a);
                }
                for (k = 1; k <= i -1; k++)
                {
                    Console.Write(a);
                }
                d--;
                Console.WriteLine();
            }
           

            Console.ReadKey();