Arrow

using System;

namespace Arrow
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            var diezMid = Math.Ceiling(n / 2.0);
            var dotsMid = n - 2;
            var dotsUp = n / 2;            //Console.WriteLine(dotsMid);
            var up = new string('.', dotsUp) + new string('#', n) + new string('.', dotsUp);
            var mid = new string('#', (int)diezMid) + new string('.', dotsMid) + new string('#', (int)diezMid);
            Console.WriteLine(up);
            for (int i = 0; i < dotsMid; i++)
            {
                var between = new string('.', dotsUp) + "#" + new string('.', dotsMid) + "#" + new string('.', dotsUp);
                Console.WriteLine(between);
            }
            Console.WriteLine(mid);
            //var dotsUp = n / 2;
            var dotsDown = (2 * n - 1) - 4;
            for (int i = 1; i < n - 1; i++)
            {
                var down = new string('.', i) + "#" + new string('.', dotsDown) + "#" + new string('.', i);
                dotsDown -= 2;
                Console.WriteLine(down);
            }
            var finish = new string('.', n-1) + "#" + new string('.', n-1);
            Console.WriteLine(finish);

        }
    }
}