How Many Sheep Are There?

Two guys are walking near a ranch. They notice a herd of sheep in the distance, and after only 30 seconds the first guy tells the other one that there are 437 sheep.
Naturally, the second guy didn't believe him so he went over the fence and after asking the owner, he found out that there indeed are 437 sheep. Still in shock, he asked his friend how the hell did he count all those sheep so fast, to which the first guy replied: It's easy, just count the legs and divide by 4.