How many five year olds could you take in a fight?

We've all thought about it. When the apocalypse comes (zombie, meteorite or other), and the world's five year olds turn on us, how long will you hold out? Finally, a site to answer your questions - howmanyfiveyearoldscouldyoutakeinafight.com

The rules:

* You are in an enclosed area roughly the size of a basketball court
* There are no weapons or foreign objects
* Everyone is wearing a cup (so no kicks to the groin)
* The children are merciless and will show no fear
* If a child is knocked unconscious, he is "out." The same goes for you.

Incidentally, I'd only take 20 of them down before they got me. Blame it on my lack of willingness to use a small child as a weapon.