The school sold a batch of books and distributed them to 18 classes on average, with 206 books per class, and the remaining 430 books were placed in the library. How many books are there in total?
学校卖来一批图书，平均发给18个班，每班206本，还剩430本放在图书室．这批图书一共有多少本？
<gadget id="calculator">18 * 206</gadget>
<output>3_708</output>

<gadget id="calculator">3_708 + 430</gadget>
<output>4_138</output>

<result>4_138</result>