Butterfly

using System;

namespace Butterfly
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            var mid = n - 1;
            var up = n - 2;
            var midPart = new string(' ', mid) + "@" + new string(' ', mid);

            var upOdd = "";
            var upEven = "";
            var downOdd = "";
            var downEven = "";
            for (int i = 1; i <= up; i++)
            {
                if (i%2==0)
                {

                    upOdd = new string('-', up) + "\\" + new string(' ', 1) + "/" + new string('-', up);
                    Console.WriteLine(upOdd);
                }
                else
                {
                    upEven = new string('*', up) + "\\" + new string(' ', 1) + "/" + new string('*', up);
                    Console.WriteLine(upEven);
                }
            }

            Console.WriteLine(midPart);

            for (int i = 1; i <= up; i++)
            {
                if (i % 2 == 0)
                {

                    downOdd = new string('-', up) + "/" + new string(' ', 1) + "\\" + new string('-', up);
                    Console.WriteLine(downOdd);
                }
                else
                {
                    downEven = new string('*', up) + "/" + new string(' ', 1) + "\\" + new string('*', up);
                    Console.WriteLine(downEven);
                }
            }

        }
    }
}