Sand Glass

using System;

namespace SandGlass
{
    class SandGlass
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            int k = n - 2;
            int m = 1;

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