Sandglass

using System;

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

        int outerDots = 0;
        int innerAsterisks = size;

        for (int i = 0; i < size; i++)
        {
            Console.WriteLine(
                "{0}{1}{0}",
                new string('.', outerDots),
                new string('*', innerAsterisks));

            if (i >= size / 2)
            {
                outerDots--;
                innerAsterisks += 2;
            }
            else
            {
                outerDots++;
                innerAsterisks -= 2;
            }
        }
    }
}