On Arbor Day, the school organized students from 4 grades to plant trees. Each grade has 5 classes, and each class planted 49 trees. How many trees did the students plant in total?
植树节学校组织4个年级的学生去植树，每个年级有5个班，每个班植树49棵，同学们一共植树多少棵？
<gadget id="calculator">49 * 5 * 4</gadget>
<output>980</output>

<result>980</result>