Stop-Sign

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

namespace StopSign
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int width = 4 * n + 3;

            Console.WriteLine("{0}{1}{0}",new string('.', n + 1),
                new string('_',width - (2 * n + 2)));

            for (int i = 0; i < n; i++)
            {
                Console.WriteLine("{0}//{1}\\\\{0}", new string('.', n - i),
                    new string('_', width - 2 * n - 4 + (2 * i)));
            }

            Console.WriteLine("//{0}STOP!{0}\\\\",
                new string('_', (width - 9) / 2));

            for (int i = 0; i < n; i++)
            {
                Console.WriteLine("{0}\\\\{1}//{0}", new string('.',i),
                    new string('_', width - (2 * i) - 4));
            }
        }
    }
}