Bat’Goiko Tower

using System;

class BatBoykoTower
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int totalWidth = 2 * n;
        int height = n;

        int dots = n - 1;
        int currentCrossbeam = 1;
        int nextCrossbeam  = 3;

        for (int i = 0; i < height; i++)
        {
            Console.Write(new string('.', dots));
            Console.Write('/');

            if (currentCrossbeam == i)
            {
                Console.Write(new string('-', totalWidth - (2 * dots) - 2));
                currentCrossbeam = nextCrossbeam;
                nextCrossbeam = 2 * currentCrossbeam - i + 1;
            }
            else
            {
                Console.Write(new string('.', totalWidth - (2 * dots) - 2));
            }

            Console.Write('\\');
            Console.WriteLine(new string('.', dots));
            dots--;
        }
    }
}