The auditorium of Nanhu Theater is divided into upper and lower floors. There are 560 seats upstairs and 9 rows downstairs with 28 seats in each row. How many seats are there in this theater?
南湖影剧院观众席分上、下两层．楼上有560个座位，楼下有9排，每排有28个座位．这个影剧院一共有多少个座位？
<gadget id="calculator">9 * 28</gadget>
<output>252</output>

<gadget id="calculator">252 + 560</gadget>
<output>812</output>

<result>812</result>