The dance teacher in the school needs to notify 125 students to rehearse the dance, and he will be notified by phone (one notification per minute), at least how many minutes it will take.
学校里的舞蹈老师，要通知125名同学来排练舞蹈，用打电话的方通知(1分钟通知1个)，至少要多少分钟．
<result>7</result>