There are 842 story books, popular science books and comic books in the school library, including 280 story books, 320 popular science books, and the rest are comic books. How many comic books are there?
学校图书室有842本故事书、科普读物和连环画，其中故事书280本，科普读物320本，其余是连环画．连环画有多少本？
<gadget id="calculator">842 - 280 - 320</gadget>
<output>242</output>

<result>242</result>