04.Arrow

using System;

namespace _04.Arrow
{
    class Arrow
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            var outerDots = (n - 1) / 2;
            var innerDots = n - 2;

            Console.WriteLine("{0}{1}{0}",
                new string('.', outerDots),
                new string('#', n));

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

            Console.WriteLine("{0}{1}{0}",
                new string('#', outerDots + 1),
                new string('.', innerDots));

            outerDots = 1;
            innerDots = 2 * n - 5;

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

                outerDots++;
                innerDots -= 2;
            }

            Console.WriteLine("{0}#{0}", new string('.', outerDots));
        }
    }
}