Beibei saved enough money by selling newspapers to buy a bicycle. He immediately told the two children, and after 10 minutes, the three of them each told the two children. After another 10 minutes, all the people who got the news told 2 friends each. Assuming that the news is passed on like this, and their respective friends do not overlap, how many people will know that Beibei bought a bicycle after 1 hour.
贝贝通过卖报纸存够了钱去买一辆自行车，他马上告诉了2个小朋友，10分钟后他们三人又各自告诉了2个小朋友．再过10分钟，所有获知消息的人又每人告诉了2个朋友．假设消息照这样传下去，他们各自的朋友不重叠，1小时后，将有多少人知道贝贝买自行车．
<gadget id="calculator">3 * 3 * 3 * 3 * 3 * 3 * 3</gadget>
<output>2_187</output>

<result>2_187</result>