There are 24 rows of seats in a theater, the first row has 20 seats, and each rear row has two more seats than the front row. How many seats are there in total in this theater?
一个剧场设置了24排座位，第一排有20个座位，后面每排都比前面一排多两个座位，这个剧场共有多少个座位．
<gadget id="calculator">24 - 1</gadget>
<output>23</output>

<gadget id="calculator">23 * 2</gadget>
<output>46</output>

<gadget id="calculator">20 + 46</gadget>
<output>66</output>

<gadget id="calculator">20 + 66</gadget>
<output>86</output>

<gadget id="calculator">24 / 2</gadget>
<output>12</output>

<gadget id="calculator">86 * 12</gadget>
<output>1_032</output>

<result>1_032</result>