Hello, sultanontop!

This is a children's problem . . .

A bus contain 7 girls.

Each girl carry 7 bags.

Inside each bag there are 7 cats.

Every cat has 7 kittens.

How many legs are in the Bus?

There are 7 girls with two legs each: 14 legs

There are bags.

There are: cats with 4 legs each: 1372 legs

There are: kittens with 4 legs each: 9604 legs

. . Add 'em up!