There are a total of 900 seats in the theater, only the first 4 rows are full of people, each row has 132 seats, how many seats are unoccupied?
剧场一共有900个座位，只有前4排坐满了人，每排132个座位，还有多少个座位没有坐人？
<gadget id="calculator">132 * 4</gadget>
<output>528</output>

<gadget id="calculator">900 - 528</gadget>
<output>372</output>

<result>372</result>