Are you smarter than a 5th grader?

There is a bus with 7 children inside. Each child has 7 bags. Inside each bag there are 7 big cats. Each big cat has 7 small cats. All cats have 4 legs each. How many legs are inside the bus?

By way of explanation for those who need it -
7 kids x 7 bags = 49 bags
49 bags x 7 big cats each = 343 big cats
343 big cats x 4 legs each = 1372 big cat legs
343 big cats x 7 kittens = 2401 kittens
2401 kittens x 4 legs = 9604 kitten legs
7 kids x 2 legs = 14 kids legs
1372 big cat legs + 9604 kitten legs + 14 kids legs = 10990 legs.
There is a driver too so there would be 10992 legs.