SignStop

t n = int.Parse(Console.ReadLine());

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

            string topRowsLabel = "{0}//{1}\\\\{0}";
            int midSymCount = 2 * n - 1;

            for (int i = 0; i < n; i++)
            {
                string row = string.Format(topRowsLabel,
                             new string('.', n - i),
                             new string('_', midSymCount));

                midSymCount += 2;

                Console.WriteLine(row);
            }

            Console.WriteLine("//{0}STOP!{0}\\\\",
                new string('_', (midSymCount - 5) / 2));

            string botRowsLabel = "{0}\\\\{1}//{0}";

            for (int i = 0; i < n; i++)
            {
                string row = string.Format(botRowsLabel,
                    new string('.', i),
                    new string('_', midSymCount));

                midSymCount -= 2;

                Console.WriteLine(row);
            }