雨後的一道彩虹-藍寶

There is a bus with 7 girls inside，  (車上有 7個女孩 )
Each girl has 7 bags， (每個女孩有 7個包 )
Inside each bag， there are 7 big cats， ( 每個包裡有7 只貓)
Each big cat has 7 small cats， (每只貓還有 7只小貓)
All cats have 4 Legs each! ( 每只貓都只有4條腿 )
Question: How many Legs are there inside the bus？( 請問車上有多少條腿)  
The total number of Legs would be the password for this file：  ( 腿的總數是附件的密碼 )
If you can't open the file， the answer you obtained is wrong ( 如果你打不開， 證明的你的答案是錯的)

http://www.badongo.com/file/7184748

算的出來答案是什麼嗎?

(努力算中)

有答案的說一下吧 = v =