Since they seem to only have a couple problems up, you can keep trying until you get it, and try to be quicker on the next problems. Or just do it for fun, like

Since they seem to only have a couple problems up, you can keep trying until you get it, and try to be quicker on the next problems. Or just do it for fun, like problems on Project Euler (www.projecteuler.net for those that don't know).