There are 39 science and technology books in the library, and the number of story books is 12 times more and 15 times less than the number of science and technology books. How many story books are there at most in the library?
图书馆有39本科技书，故事书的本数比科技书的12倍多一些，15倍少一些，图书馆最多有多少本故事书？
<gadget id="calculator">39 * 15</gadget>
<output>585</output>

<gadget id="calculator">585 - 1</gadget>
<output>584</output>

<result>584</result>