The school is going to hold a rope skipping competition. If the whole class is divided into groups of 5, 9 and 15, and the division is over, how many people are there in the class at least?
学校要举行一次跳绳比赛，如果把全班学生分为5人一组，9人一组，15人一组，恰好分完，这个班至少有多少人？
<gadget id="calculator">3 * 3 * 5</gadget>
<output>45</output>

<result>45</result>