A bookstore donated 2,438 books to a school in the disaster area, with an average of 126 books distributed to each class. After 18 classes, how many books will the school have?
某书店为灾区某校捐了2438本图书，平均每班发126本，发完18个班后，学校的图书还有多少本？
<gadget id="calculator">126 * 18</gadget>
<output>2_268</output>

<gadget id="calculator">2_438 - 2_268</gadget>
<output>170</output>

<result>170</result>