Select 1 person from 20 outstanding students to participate in international exchange activities. The selection method is to stand in a row of 20 students and report the number. The students who reported an odd number are defeated and withdraw from the queue. Lost, exit the queue. Xiao Ming really wants to participate in this event. In order to ensure that he is selected, what is the number he reported in the first queue.
从20个优秀学生中选1人去参加国际交流活动选取方法是将20人站成一排，报数，报奇数的同学落选并退出队列，剩下的同学再依次报数，仍然是报奇数的同学落选，退出队列．小明非常想去参加这个活动，为了保证自己被选中，他第一次排队时报的数是多少．
<gadget id="calculator">2 ** 4</gadget>
<output>16</output>

<result>16</result>