In April, the school held a double exercise and one punch competition. There were 30 classes participating. Each class was arranged in 4 rows with 12 students in each row. How many people participated in the competition?
4月，学校进行两操一拳比赛，有30个班参加，每个班排成4列，每列有12人，一共有多少人参加比赛？
<gadget id="calculator">12 * 4 * 30</gadget>
<output>1_440</output>

<result>1_440</result>