I'm proud to say it took me just that little bit longer, so I guess you can call me brainy - or perhaps just an abstract thinker, that's more likely. Although the 15 minutes it took me were also filled with browsing the Bill Gates story, stupidly expecting to find the solution there, and considering whether to do a Googlesearch for said solution. But pride prevailed! If a load of scientist friends can do it, so can I!
