How good is your Math.....

Challenge :
There's a bus with 7 girls
Each girl carries 7 bags
Each bag carries 7 big cats
Each big cat carries 7 smaller cats
All the cats have 4 legs )

Question : how many legs are on the bus ?

The answer is the password to open the attached file.
Once you are in, you can put your name on the list and forward it on.

Good luck