Sacred Haven of Debauchery

Actually, it's a pretty simple problem, from the school curriculum.

so it's not simple, since my answer doesn't match yours.
I'll figure out how this is happening.

Let's try something from mathematical cybernetics.

what is that?
I'm not going to study cybernetics. I'm more interested in theory right now, because I have courses in September, and I don't even know the basics. But the problems there are so strange that I can't even solve the very first one (read: "the easiest one") . I don't think they belong here.