Here's a Math Riddle About a Traveller(You won't need a calculator for this one).?

As I was going to St. Ives, I met a man w/ 7 wives.Ea. wife had 7 sacks,ea. sack had 7 cats,ea. cat had 7 kittens.Kittens,cats,sacks & wives how many were going to St.Ives?