Sandglass

using System;

class Sandglass
{
    static void Main()
    {
        int size = int.Parse(Console.ReadLine());

        Console.WriteLine(
            "{0}",
            new string('*', size));

        int nexDots = 1;
        int topDots = size - 2;

        for (int i = 1; i < size / 2; i++)
        {
            Console.WriteLine(
                "{0}{1}{0}",
                new string('.', nexDots),
                new string('*', topDots));

            nexDots++;
            topDots -= 2;
        }

        Console.WriteLine(
            "{0}{1}{0}",
            new string('.', size / 2),
            new string('*', 1));

        nexDots--;
        topDots += 2;

        for (int i = 0; i < size / 2; i++)
        {
            Console.WriteLine(
                "{0}{1}{0}",
                new string('.', nexDots),
                new string('*', topDots));

            nexDots--;
            topDots += 2;
        }
    }
}