Cube-3D

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

namespace _04.Cube_3D
{
    class Program
    {
        static void TopPartCube3D(int n)
        {
            int colon = n;
            int space=n-2;
            int verticalLine=1;
            Console.WriteLine("{0}",new string(':',colon));
            Console.WriteLine(":{0}::", new string(' ', space));
            for (int row = 1; row <= n - 2; row++)
            {
                if (row == n-2)
                {
                    Console.WriteLine("{0}{1}:", new string(':', colon),
                    new string('|', verticalLine));
                }
                else
                {
                    Console.WriteLine(":{0}:{1}:", new string(' ', space), new string('|', verticalLine));
                    verticalLine++;
                }
            }
            int minus = n-2;
            verticalLine--; ;
            colon = 1;
            space = 1;
            for (int row = 0; row < n-2; row++)
            {
                Console.WriteLine("{0}:{1}:{2}:", new string(' ', space), new string('-', minus),
                    new string('|', verticalLine));
                verticalLine--;
                space++;
            }
            colon =n;

            Console.WriteLine("{0}{1}", new string(' ', space),new string(':', colon));
        }
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            TopPartCube3D(n);
        }
    }
}