Triangle

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

namespace Triangle
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int dots = 1;
            int grids = n * 2 - 1;
            int spaces = 1;

            Console.WriteLine(new string ('#', (n * 4) + 1));
            for (int u = 1; u <= n; u++)
            {
                Console.WriteLine(new string('.', dots) + new string('#', grids) + new string(' ', spaces) + new string('#', grids) + new string('.', dots));
                dots++;
                grids -= 2;
                spaces += 2;
                if (grids < 1)
                {
                    break;
                }
                if (u == n / 2)
                {
                    Console.WriteLine(new string('.', dots) + new string('#', grids) + new string(' ', n / 2 - 1) + "(@)"+ new string(' ', n / 2 - 1) + new string('#', grids) + new string('.', dots));
                    dots++;
                    grids -= 2;
                    if (grids < 1)
                    {
                        break;
                    }
                    spaces += 2;
                }
            }
            int dots2 = n + 1;
            int grids2 = n * 2 - 1;
            for (int d = 0; d < n; d++)
            {
                Console.WriteLine(new string('.', dots2) + new string('#', grids2) + new string('.', dots2));
                dots2++;
                grids2 -= 2;
            }
        }
    }
}