I don't know. How many?
Oh, you don't know either? Then why did you bring it up?
Apple's cash flow was only 14 times Amazon's, and their market cap is nearly 4 times as big. The market obviously believes Amazon will grow, while Apple has peaked. Apple's P/E and other valuation metrics are roughly on par with ExxonMobil's, so it's not as if Apple's valuation is all that low.
Well, if you want to look at cash flow, maybe you should look at cash flow for the last quarter:
Apple's cash flow increased by 33% over the previous year:
So this quarter was so bad that their cash flow only increased by 33% - and that was with one fewer week.