05. Mask

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

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

            var rowWidth = (2 * n) + 2;

            //top
            int emptySpaces = n - 2;
            int emptySpacesInside = 0;

            for (int i = 0; i < n - 1; i++)
            {
                Console.WriteLine("{0}/{1}|  |{1}\\", new string(' ', emptySpaces), new string (' ',emptySpacesInside));
                emptySpacesInside++;
                emptySpaces--;
            }

            Console.WriteLine(new string ('-', rowWidth));

            //middle 2 rows
            int emptySpacesMiddleStart = n / 2 - 1;
            int emptySpacesMiddleInside = rowWidth - (emptySpacesMiddleStart * 2) - 4;
            Console.WriteLine("|{0}_{1}_{0}|", new string (' ', emptySpacesMiddleStart), new string (' ', emptySpacesMiddleInside));
            Console.WriteLine("|{0}@{1}@{0}|", new string(' ', emptySpacesMiddleStart), new string(' ', emptySpacesMiddleInside));

            //middlemiddle rows
            for (int i = 1; i <= n / 2; i++)
            {
                int emptySpacesMiddleMiddle = rowWidth - 2;
                Console.WriteLine("|{0}|", new string(' ', emptySpacesMiddleMiddle));
            }

            //mounth + nose
            int emptySpacesAroundNose = (rowWidth - 4) / 2;
            int emptySpacesAroundMounth = (rowWidth - 6) / 2;
            Console.WriteLine("|{0}OO{0}|", new string (' ', emptySpacesAroundNose));
            Console.WriteLine("|{0}/  \\{0}|", new string(' ', emptySpacesAroundMounth));
            Console.WriteLine("|{0}||||{0}|", new string(' ', emptySpacesAroundMounth));

            //bottom
            int dashesCount1 = 1;
            int dashesCount2 = 1;
            int dotsCount = rowWidth - 2;
            for (int row = 1; row <= n + 1; row++)
            {
                Console.WriteLine("{0}{1}{2}", new string('\\', dashesCount1), new string ('`', dotsCount), new string ('/', dashesCount2));
                dashesCount1++;
                dotsCount -= 2;
                dashesCount2++;
            }
        }
    }
}