<Tr> <Th> No. of books </Th> <Td> 5 </Td> </Tr> <Tr> <Th> Followed by </Th> <Td> The Heroes of Olympus </Td> </Tr> <P> Percy Jackson & the Olympians, often shortened to Percy Jackson, is a pentalogy of fantasy adventure novels written by American author Rick Riordan, and the first book series in the Camp Half - Blood Chronicles . Five supplementary books, along with three graphic novels, have also been released . More than 45 million copies of the books have been sold in more than 35 countries . </P> <P> As of October 28, 2011, the series has been on The New York Times Best Seller list for children's book series for 245 weeks . The first book was adapted into a film titled Percy Jackson & the Olympians: The Lightning Thief in 2010, which was commercially successful, but received mixed reviews . An adaptation of the second book, titled Percy Jackson: Sea of Monsters, was released in 2013 . </P>

How many percy jackson and the olympians books are there
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