There are 302 seats upstairs in the cinema, and the number of seats downstairs is three times that of the upstairs. How many more seats are downstairs than upstairs?
电影院楼上有302个座位，楼下的座位是楼上的3倍．楼下比楼上多多少个座位？
<gadget id="calculator">302 * 3</gadget>
<output>906</output>

<gadget id="calculator">906 - 302</gadget>
<output>604</output>

<result>604</result>