The school held broadcasting exercises for grades 3, 4, and 5. There were 6 classes in each grade, and 45 people were selected from each class to participate. How many people participated in the broadcasting exercises?
学校举行三、四、五年级广播操表演，每个年级各有6个班，每班选45个人参加，参加广播操表演的有多少人？
<gadget id="calculator">45 * 6 * 3</gadget>
<output>810</output>

<result>810</result>