Explorer.cs

using System;

    class TheExplorer
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            int outerDashes = 0;
            int innerDashes = 1;
            int lowerOuterDashes = 1;
            int lowerInnerDashes = n-4;

            Console.WriteLine("{0}*{0}", new string('-', (n - 1) / 2));
            for (int i = 0; i < (n-3)/2; i++)
            {
                outerDashes = (n - 2 - innerDashes)/2;
                Console.WriteLine("{0}*{1}*{0}", new string('-', outerDashes), new string('-', innerDashes));
                innerDashes += 2;
            }
            Console.WriteLine("*{0}*",new string('-', n-2));
            for (int i = 0; i < (n-3)/2; i++)
            {
                lowerOuterDashes = (n-2-lowerInnerDashes)/2;
                Console.WriteLine("{0}*{1}*{0}", new string('-', lowerOuterDashes), new string('-', lowerInnerDashes));
                lowerInnerDashes -= 2;
            }
            Console.WriteLine("{0}*{0}", new string('-', (n - 1) / 2));
        }
    }