It's 14, if I remember correctly.

Anyway, the problems should be D2-related in one way or another. Personally, I think it should take some teamwork, although there's only one winner who can "backstab" the ones who help him out to be the first to win the price. It's going to be rough, and you might have to be careful with sharing your secrets, but it might pay off to help others out...

Actually, I'm just brainstorming a bit.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram