The teacher should notify the students to go to the school to receive the notification. If 2 people are notified every minute, each student will notify 2 people respectively, and so on, how many people can be notified in 5 minutes.
老师要通知同学们到学校领通知书，如果每分钟通知2人，每位同学又分别通知2人，依此类推，5分针可以通知多少人．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">18 + 8</gadget>
<output>26</output>

<gadget id="calculator">26 + 1</gadget>
<output>27</output>

<gadget id="calculator">27 * 2</gadget>
<output>54</output>

<gadget id="calculator">54 + 26</gadget>
<output>80</output>

<gadget id="calculator">80 + 1</gadget>
<output>81</output>

<gadget id="calculator">81 * 2</gadget>
<output>162</output>

<gadget id="calculator">162 + 80</gadget>
<output>242</output>

<result>242</result>