Figure.Arrow

using System;
class Arrow
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
            //first line
            Console.WriteLine("{0}{1}{0}", new string('.', n / 2), new string('#', n));
            //end first line

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

            // third line
            Console.WriteLine("{0}{1}{0}", new string('#', n / 2 + 1), new string('.', n - 2));
            // end third line

            //fourth line
            int width = n*2-1;
            int outDotsThird = 1;
            for (int i = 0; i < n - 2; i++)
            {
                Console.WriteLine("{0}#{1}#{0}", new string('.', outDotsThird), new string('.', width-4));
                width -= 2;
                outDotsThird++;
            }
                // last line
                Console.WriteLine("{0}#{0}", new string ('.',n-1));
        }
    }