The school rehearses a large-scale group gymnastics. It is necessary to select 36 students from each class of grades 3 to 6. There are 5 classes in each grade. How many students will participate in the group gymnastics performance?
学校排练大型团体操，要从3～6年级每班选出36名同学，每个年级有5个班，参加团体操表演的同学一共有多少人？
<gadget id="calculator">36 * 5 * 4</gadget>
<output>720</output>

<result>720</result>