There are 278 popular science books in the book corner of Class 1 of the sixth grade, and 78 more literary books than 50% of the total number of popular science books and literary books. How many literary books are there?
六年级1班图书角有278本科普读物，文艺书比科普读物和文艺读物总量的50%还多78本．文艺书有多少本？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">217 / (1/2)</gadget>
<output>434</output>

<result>434</result>