The school bought back a batch of books and distributed them to 4 classes of the third grade, each class had 52 books, and the remaining 156 books were distributed to the first grade. How many books did the school buy back in total?
学校购回一批图书，发给三年级4个班，每班52本，剩下156本发给一年级，学校共购回图书多少本？
<gadget id="calculator">52 * 4</gadget>
<output>208</output>

<gadget id="calculator">208 + 156</gadget>
<output>364</output>

<result>364</result>