HouseWithWindow

using System;
namespace HouseWithWindow
{
    class HouseWithWindow
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine(new string('.', n - 1) + "*" + new string('.', n - 1));

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

            Console.WriteLine(new string('*', 2 * n - 1));

            for (int i = 0; i < n; i++)
            {
                if (i + 1 <= n/4 || i >= 3*n/4)
                {
                    Console.WriteLine("*" + new string('.', 2*n - 3) + "*");
                }
                else
                {
                    Console.WriteLine("*" + new string('.', n/2) +
                        new string('*', n - 3) + new string('.', n/2) + "*" );
                }
            }

            Console.WriteLine(new string('*', 2 * n - 1));
        }
    }
}