The company is going to hold an important meeting. So the chairman calls 6 regional managers, who call their 6 department managers, and each department manager calls their 6 subordinates. If everyone is notified only once, how many people know that there is a meeting.
公司要召开一次重要会议．于是董事长给6名区域经理打电话，这6名区域经理给各自的6个部门经理打电话，每个部门经理又给各自的6个下属再打电话．若每个人都只被通知了一次，有多少人知道要开会．
<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">6 * 6 * 6</gadget>
<output>216</output>

<gadget id="calculator">1 + 6 + 36 + 216</gadget>
<output>259</output>

<result>259</result>