TheExplorer

using System;

class TheExplorer
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int outside = n / 3 ;
        int inside = 1;

        Console.Write(new string('-', outside + 1));
        Console.Write(new string('*', 1));
        Console.Write(new string('-', outside + 1));
        Console.WriteLine();

        while (outside != 0)
        {
            Console.Write(new string('-', outside));
            Console.Write(new string('*', 1));
            Console.Write(new string('-', inside));
            Console.Write(new string('*', 1));
            Console.Write(new string('-', outside));
            Console.WriteLine();
            inside +=2;
            outside--;
        }

        Console.Write(new string('*', 1));
        Console.Write(new string('-', inside));
        Console.Write(new string('*', 1));
        Console.WriteLine();

        outside++;
        inside -= 2;

        while (outside != 0)
        {
            if (inside < 0)
            {
                break;
            }
            else
            {
                Console.Write(new string('-', outside));
                Console.Write(new string('*', 1));
                Console.Write(new string('-', inside));
                Console.Write(new string('*', 1));
                Console.Write(new string('-', outside));
                Console.WriteLine();
                inside -= 2;
                outside++;
            }
        }

        Console.Write(new string('-', outside));
        Console.Write(new string('*', 1));
        Console.Write(new string('-', outside));
        Console.WriteLine();
    }
}