The children's cinema has row a of seats downstairs, with 56 seats in each row, and row b of seats upstairs, with 48 seats in each row. When a=30 and b=20, how many seats does the movie theater have?
儿童电影院楼下有a排座位，每排56个座位，楼上有b排座位，每排有48个座位，当a=30，b=20时，这个电影院一共有多少个座位？
<gadget id="calculator">56 * 30</gadget>
<output>1_680</output>

<gadget id="calculator">48 * 20</gadget>
<output>960</output>

<gadget id="calculator">1_680 + 960</gadget>
<output>2_640</output>

<result>2_640</result>