A bookshelf has two floors, the upper layer stores 80 books, and the lower layer stores 12 more books than the upper layer. How many books are there in total on this bookshelf?
一个书架，上下两层，上层存放了80本书，下层存放的图书比上层的4倍还多12本．这个书架上一共存放了多少本书？
<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<gadget id="calculator">320 + 12 + 80</gadget>
<output>412</output>

<result>412</result>