At the beginning of the new semester, the school purchased a batch of notebooks. 240 copies are distributed in each class, 16 classes have been distributed, and there are 870 copies left. How many notebooks did the school purchase in total?
新学期开始，学校购进一批笔记本．每班发240本，已经发了16个班，还剩870本．学校一共购进多少本笔记本？
<gadget id="calculator">240 * 16</gadget>
<output>3_840</output>

<gadget id="calculator">3_840 + 870</gadget>
<output>4_710</output>

<result>4_710</result>