A theater has 40 rows of seats, the first row has 76 seats, the rear row has 2 more seats than the previous row, and the last row has 152 seats. How many seats are there in total in this theater?
一个剧场设置了40排座位，第一排有76个座位，往后逐排比前一排多2个座位，最后一排有152个座位，这个剧场一共设置了多少个座位？
<gadget id="calculator">76 + 152</gadget>
<output>228</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">228 * 20</gadget>
<output>4_560</output>

<result>4_560</result>