05. triangle

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

namespace _05.Триъгълник
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Console.WriteLine("{0}", new string('#', 4 * n + 1));
            for (int i = 0; i < n / 2; i++)
            {
                Console.WriteLine("{0}{1}{2}{1}{0}",
                    new string('.', i + 1), new string('#', 2 * n - 1 - 2 * i), new string(' ', 1 + i * 2));
            }
            if (n % 2 == 0)
            {
                Console.WriteLine("{0}{1}{2}(@){2}{1}{0}",
                new string('.', n / 2 + 1), new string('#', n - 1), new string(' ', n / 2 - 1));
            }
            else
            {
                Console.WriteLine("{0}{1}{2}(@){2}{1}{0}",
                    new string('.', n / 2 + 1), new string('#', n), new string(' ', n / 2 - 1));
            }
            if (n % 2 == 0)
            {
                for (int i = 0; i < n / 2 - 1; i++)
                    Console.WriteLine("{0}{1}{2}{1}{0}", new string('.', (5 * n - 2 * (n - 3 ) - n + 3 ) / 4 + i), new string('#', n - 3 - 2 * i), new string(' ', n + 3 + 2 * i));
            }
            else
            {
                for (int i = 0; i < n / 2; i++)
                    Console.WriteLine("{0}{1}{2}{1}{0}", new string('.', (5 * n - 2 * (n - 3) - n + 3) / 4 + i), new string('#', n - 2 - 2 * i), new string(' ', n + 2 + 2 * i));
            }
            for (int i = 0; i < n ; i++)
            {
                Console.WriteLine("{0}{1}{0}",
                    new string('.', n + 1 + i), new string('#', n * 2 - 1 - 2 * i));
            }
        }
    }
}