O.k., I have three possibilities for N. Thanks to everyone who commented (sarcasm, again).
Actually a very simple question when you get down to it. And the math lingo all came back to me as soon as I really read it. Anyway, thanks to Sped for the dare (not sarcastic this time).
Other then that, good day so far. Rained on our parade, literally, but was still fun. Plus stuff. That's all I want to write now though.