The full score of each test is 100 points. The average score of Xiao Ming's 4 exams is 89 points. In order to make the average score reach 94 points (or more) as soon as possible, how many times should he take the exam at least.
每次考试满分是100分．小明4次考试的平均成绩89分，为了使平均成绩尽快达到94分(或更多)，他至少再要考多少次．
<result>4</result>