There are 50 students electing the monitor, and the person with the most votes is elected. During the counting of the votes, it was found that Liu Yan had obtained 18 votes, Zhang Jun had obtained 16 votes, and Li Ming had obtained 9 votes. As long as Liu Yan gets at least as many votes as possible, she will definitely become the squad leader.
有50名学生选班长，得票最多的人当选．中途计票时发现刘燕已得18票，张军已得16票，李明已得9票．刘燕至少再得多少票就一定能成为班长．
<result>3</result>