05.02 Пеперуда

using System;
class Butterfly
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());

        // using ?: operator https://msdn.microsoft.com/en-us/library/ty67wk28.aspx
        for (int i = 0; i < n - 2; i++)
        {
            Console.WriteLine("{0}\\ /{0}", new string(i % 2 == 0 ? '*' : '-', n - 2));
        }
        Console.WriteLine(new string(' ', n - 1) + "@");
        for (int i = 0; i < n - 2; i++)
        {
            Console.WriteLine("{0}/ \\{0}", new string(i % 2 == 0 ? '*' : '-', n - 2));
        }
    }
}