An ant "scout" found food outside the cave, and it immediately returned to the ant nest to inform its companions. Assuming that an ant can convey information to 4 companions within one minute, then, no more than how many minutes, all 2000 ants in the ant nest know the news. (result rounded to an integer)
一只蚂蚁"侦察兵"在洞外发现了食物，它立刻回到蚁穴通知同伴．假设一只蚂蚁在一分钟内可以把信息传达给4个同伴，那么，不超过多少分钟，蚁穴里的全部2000只蚂蚁都知道了这个消息．(结果取整数)
<result>5</result>