The school library recently bought a batch of books, including 108 science and technology books, and fairy tale books are three times the number of science and technology books. How many books are there in total?
学校图书室最近新买了一批图书，其中科技类图书有108本，童话类图书是科技类图书的3倍．两种图书共有多少本？
<gadget id="calculator">108 * 3</gadget>
<output>324</output>

<gadget id="calculator">324 + 108</gadget>
<output>432</output>

<result>432</result>