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)
        {
            string tripleEmpty ="   ";
            string alphaAndOmega = "(@)";
            string helper = "   ";
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine(new string('#', n * 4 + 1));
            Console.WriteLine('.' + new string('#', n * 2 - 1) + ' ' + new string('#', n * 2 - 1) + '.');
            for (int i = 0; i < n-1; i++)
            {
                if (i == n / 2 - 1)
                {
                    tripleEmpty = alphaAndOmega;
                }
                Console.WriteLine(new string('.', 2 + i) + new string('#', n * 2 - 3 - 2 * i) + new string(' ', i) + tripleEmpty + new string(' ', i) + new string('#', n * 2 - 3 - 2 * i) + new string('.', 2 + i));
                tripleEmpty = helper;
            }
            for (int i = 0; i < n; i++)
            {
                Console.WriteLine(new string('.', n + 1 + i) + new string('#', n * 2 - 1 - 2 * i) + new string('.', n + 1 + i));
            }
        }
    }
}