The general manager of a company led three department managers to participate in the public welfare activity of cleaning up garbage. The three department managers each found 3 responsible persons, and each responsible person also found 3 employees to participate together. This public welfare activity has a total of How many people have gone?
某公司总经理带领3个部门经理一起参加清理垃圾的公益活动，三个部门经理每人各找了3个负责人，每个负责人又各找了3个员工一起参加，这次公益活动一共去了多少人．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 3</gadget>
<output>27</output>

<gadget id="calculator">1 + 3 + 9 + 27</gadget>
<output>40</output>

<result>40</result>