The art teacher wants to notify 12 students in the painting group to have a meeting. If it takes 1 minute to make a call, how long will it take to notify everyone?
美术老师要通知绘画组12个学生开会，如果每打一个电话需要1分钟，至少需要花多长时间就能通知到每个人？
<result>4</result>