There are 5 classes in the second grade, 52 books are distributed to each class, and 156 books are left to be distributed to the third grade. How many books did the school buy in total?
二年级有5个班，每班发图书52本，还剩156本发给三年级，学校共买图书多少本？
<gadget id="calculator">5 * 52</gadget>
<output>260</output>

<gadget id="calculator">260 + 156</gadget>
<output>416</output>

<result>416</result>