Explorer

using System;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        Console.WriteLine("{0}{1}{0}", new string('-', n / 2), '*');
        //Upper part and middle;
        int outerDots = n / 2 - 1;
        int innerDots = 1;
        for (int i = 0; i < n / 2; i++)
        {
            Console.WriteLine("{0}{1}{2}{1}{0}", new string('-', outerDots),
                '*', new string('-', innerDots));
            outerDots--;
            innerDots += 2;
        }
        //Lower part;
        outerDots = 1;
        innerDots = n - 4; //The middle line is n - 2 (2 stars) and the next under it
        // is n - 4;
        for (int i = 0; i < n / 2 - 1; i++)// -1, since the middle is done;
        {
            Console.WriteLine("{0}{1}{2}{1}{0}", new string('-', outerDots),
                '*', new string('-', innerDots));
            outerDots++;
            innerDots -= 2;
        }
        Console.WriteLine("{0}{1}{0}", new string('-', n / 2), '*');
    }
}