Cube

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Problem4
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            Console.Write(new string(' ', n-1));
            Console.WriteLine(new string(':', n));
            int spaces = n - 2;
            for (int i = 0; i < n - 2; i++)
            {
                Console.Write(new string(' ', spaces));
                Console.Write(':');
                Console.Write(new string('/', n - 2));
                Console.Write(':');
                Console.Write(new string('X', i));
                Console.WriteLine(':');
                spaces--;
            }
            Console.Write(new string(':', n));
            Console.Write(new string('X', n - 2));
            Console.WriteLine(':');
            int xSes = n - 3;
            spaces = 1;
            for (int i = 0; i < n - 2; i++)
            {
                Console.Write(':');
                Console.Write(new string(' ', n - 2));
                Console.Write(':');
                Console.Write(new string('X',xSes));
                Console.Write(':');
                Console.WriteLine(new string(' ', spaces));
                spaces++;
                xSes--;
            }
            Console.Write(new string(':', n));
            Console.WriteLine(new string(' ', n - 1));
        }
    }
}