4. Persian rugs

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

class Program
{
    static void Main()
    {
        Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;

        int n = int.Parse(Console.ReadLine());
        int k = int.Parse(Console.ReadLine());

        int width = 2*n + 1;

        for (int i = 0; i < n; i++)
        {
            Console.Write(new string('#', i));
            Console.Write("\\");
            if (width > 2 * i + 2 * k + 4)
            {
                Console.Write(new string(' ', k));
                Console.Write("\\");
                Console.Write(new string('.', width - 2*k - 4 - 2*i));
                Console.Write("/");
                Console.Write(new string(' ', k));
            }
            else
            {
                Console.Write(new string(' ', width - 2 - 2*i));
            }
            Console.Write("/");
            Console.WriteLine(new string('#', i));
        }
        Console.Write(new string('#', n));
        Console.Write("X");
        Console.WriteLine(new string('#', n));
        for (int i = n - 1; i >= 0; i--)
        {
            Console.Write(new string('#', i));
            Console.Write("/");
            if (width > 2 * i + 2 * k + 4)
            {
                Console.Write(new string(' ', k));
                Console.Write("/");
                Console.Write(new string('.', width - 2 * k - 4 - 2 * i));
                Console.Write("\\");
                Console.Write(new string(' ', k));
            }
            else
            {
                Console.Write(new string(' ', width - 2 - 2 * i));
            }
            Console.Write("\\");
            Console.WriteLine(new string('#', i));
        }
    }
}