FirTree

using System;

    class FirTree
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());

            for (int i = 0; i < n - 1; i++)
            {
                string dots = new String('.', n - 2 - i);
                string stars = new String('*', 2*i + 1);
                Console.Write(dots);
                Console.Write(stars);
                Console.Write(dots);
                Console.WriteLine();
            }

            string groundDots = new string('.', n - 2);
            Console.Write(groundDots);
            Console.Write("*");
            Console.Write(groundDots);
            Console.WriteLine();

        }
    }