Butterfly

using System;
class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        //first row
        //Console.WriteLine("{0}\\{1}/{0}", new string('*', n - 2), new string(' ', n - n + 1));
        //row after the first
        for (int i = 0; i < n - 2; i++)
        {
            char wingMaterial = i % 2 == 0 ? '*' : '-';
            string wings = new string(wingMaterial, n - 2);
            string line = wings + "\\ /" + wings;
            Console.WriteLine(line);
            //Console.WriteLine("{0}\\{1}/{0}", new string('-', n - 2), new string(' ', n - n + 1));
            //Console.WriteLine("{0}\\{1}/{0}", new string('*', n - 2), new string(' ', n - n + 1));
        }

        //middle row
        Console.WriteLine("{0}@{0}", new string(' ', n - 1));
        //last rows
        //first row
        //Console.WriteLine("{0}/{1}\\{0}", new string('*', n - 2), new string(' ', n - n + 1));
        //row after the first
        for (int i = 0; i < n - 2; i++)
        {
            char wingMaterial = i % 2 == 0 ? '*' : '-';
            string wings = new string(wingMaterial, n - 2);
            string line = wings + "/ \\" + wings;
            //Console.WriteLine("{0}\\{1}/{0}", new string('-', n - 2), new string(' ', n - n + 1));
            //Console.WriteLine("{0}\\{1}/{0}", new string('*', n - 2), new string(' ', n - n + 1));
            Console.WriteLine(line);
        }
    }
}