The number of books stored on the bookshelf is between 60 and 100, among which (1/5) are comic books, (1/7) are story books, how many books are stored on the bookshelf.
书架上存书的本数在60～100本之间，其中(1/5)是连环画，(1/7)是故事书，书架上存书多少本．
<gadget id="calculator">35 * 2</gadget>
<output>70</output>

<result>70</result>