<Tr> <Th> Media type </Th> <Td> Print (hardcover, paperback) </Td> </Tr> <Tr> <Th> No. of books </Th> <Td> </Td> </Tr> <P> The 100 is a series of young adult science fiction novels by Kass Morgan . The first book in the series, The 100, was published on September 3, 2013, by Little, Brown Books for Young Readers . Day 21, its sequel, was released on September 25, 2014, and Homecoming was released on February 26, 2015 . A fourth novel, Rebellion, was released on December 6, 2016 . </P> <P> Prior to the publication of the first book, television producer Jason Rothenberg became interested in adapting the story for the screen . The eponymous TV series adaptation premiered on March 19, 2014, on The CW Network, starring Eliza Taylor and Bob Morley as Clarke Griffin and Bellamy Blake, respectively . </P>

How many books are in the series the 100
find me the text answering this question