5. Mask

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

namespace _5
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            if (n%2 != 0)
            {
                int width = 2 * n + 2;
                int spaceRightLeft = n - 2;
                int spaceMiddle = width - 2 * spaceRightLeft - 4;

                for (int i = 0; i < n-1; i++)
                {

                    Console.WriteLine("{0}/{1}|{2}|{1}\\", new string(' ', spaceRightLeft), new string(' ', i), new string(' ', spaceMiddle));
                    spaceRightLeft--;
                }

                Console.WriteLine($"{new string('-', width)}");

                int rowss = n / 2 + 5;
                for (int row = 1; row <= rowss; row++)
                {
                    int spaceLeftRight = (width - 4 - (n + 1))/2;
                    if (row == 1)
                    {
                        Console.WriteLine("|{0}_{1}_{0}|", new string(' ', spaceLeftRight),new string(' ', n+1));
                    }
                    else if (row == 2)
                    {
                        Console.WriteLine("|{0}@{1}@{0}|", new string(' ', spaceLeftRight), new string(' ', n + 1));
                    }
                    else if (row == rowss)
                    {
                        int spaces = (width - 6)/ 2;
                        Console.WriteLine("|{0}||||{0}|", new string(' ', spaces));
                    }
                    else if (row == rowss - 1)
                    {
                        int spaces = (width - 6) / 2;
                        Console.WriteLine("|{0}/  \\{0}|", new string(' ', spaces));
                    }
                    else if (row == rowss-2)
                    {
                        int spaces = (width - 4) / 2;
                        Console.WriteLine("|{0}OO{0}|", new string(' ', spaces));
                    }
                    else
                    {
                        Console.WriteLine($"|{new string(' ', width - 2)}|");
                    }
                }

                int apostrophe = width - 2;
                for (int i = 1; i <= n; i++)
                {
                    Console.WriteLine("{0}{1}{2}", new string('\\', i), new string('`', apostrophe), new string('/', i));
                    apostrophe -= 2;

                }

                Console.WriteLine($"{new string('\\', n+1)}{new string('/', n+1)}");
            }
        }
    }
}