03.IlluminatiLock

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _03.IlluminatiLock
{
    class IlluminatiLock
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Console.Write(new string('.', n) + new string('#', n) + new string('.', n));
            Console.WriteLine();
            Console.Write(new string('.', n - 2) + new string('#', 3) + new string('.', n - 2)
                + new string('#', 3) + new string('.', n - 2));
            Console.WriteLine();
            int leftPoint;
            int midLeftPoint = 2;
            int midPoint = n-2 ;
            leftPoint = (3 * n - (8 + n)) / 2;
            //Top part of figure:
            for (int row = 2; row < (n + 1) / 2; row++)
            {
                Console.Write(new string('.', leftPoint));
                Console.Write(new string('#', 2));
                Console.Write(new string('.', midLeftPoint));
                Console.Write(new string('#', 1));
                Console.Write(new string('.', midPoint));
                Console.Write(new string('#', 1));
                Console.Write(new string('.', midLeftPoint));
                Console.Write(new string('#', 2));
                Console.Write(new string('.', leftPoint));
                midLeftPoint += 2;
                leftPoint -= 2;
                Console.WriteLine();
            }

            //Down part of figure
            midLeftPoint = ((3 * n - (6 + n)) / 2);
            midPoint = n - 2;
            leftPoint = 1;
            for (int row = 2; row < (n + 1) / 2; row++)
            {
                Console.Write(new string('.', leftPoint));
                Console.Write(new string('#', 2));
                Console.Write(new string('.', midLeftPoint));
                Console.Write(new string('#', 1));
                Console.Write(new string('.', n - 2));
                Console.Write(new string('#', 1));
                Console.Write(new string('.', midLeftPoint));
                Console.Write(new string('#', 2));
                Console.Write(new string('.', leftPoint));
                if (midLeftPoint>0)
                {
                    midLeftPoint -= 2;
                    leftPoint += 2;
                }
                Console.WriteLine();
            }
            Console.Write(new string('.', n - 2) + new string('#', 3) + new string('.', n - 2)
               + new string('#', 3) + new string('.', n - 2));
            Console.WriteLine();
            Console.Write(new string('.', n) + new string('#', n) + new string('.', n));
            Console.WriteLine();
        }
    }
}