Stop sign

using System;

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

            int topDots = (n + 1);
            int topDashes = (n * 2 - 1);
            int topDashesIncrease = (topDashes - 2);
            int botDotsLeft = -1;
            int botDotsRight = -1;
            int botPartDashes = (n * 4 - 1);
            int botPartDashesDecrease = (botPartDashes + 2);
            string topRow = new String('.', topDots) + new String('_', (topDashes + 2)) + new String('.', topDots);
            string middleSTOP = "//" + new String('_', (n * 2 - 3)) + "STOP!" + new String('_', (n * 2 - 3)) + "\\\\";

            //top part of the STOP sign
            Console.WriteLine(topRow);
            for (int currentRow = 0; currentRow < n; currentRow++)
            {
                Console.Write(new String('.', (n - currentRow)));
                Console.Write("//");
                Console.Write(new String('_', (topDashesIncrease += 2)));
                Console.Write("\\\\");
                Console.Write(new String('.', (n - currentRow)));
                Console.WriteLine();
            }
            Console.WriteLine(middleSTOP);

            //bot part of the STOP sign
            for (int currentRow = n; currentRow > 0; currentRow--)
            {
                Console.Write(new String('.', botDotsLeft += 1));
                Console.Write("\\\\");
                Console.Write(new String('_', botPartDashesDecrease -= 2));
                Console.Write("//");
                Console.Write(new String('.', botDotsRight += 1));
                Console.WriteLine();
            }
        }
    }
}