certain class is divided into groups of 5 people, 9 people, and 15 people in the summer camp activities. How many students are there at least in this class?
某班在夏令营活动中，分为5人一组，9人一组，15人一组都恰好无余，这个班至少有学生多少人？
<gadget id="calculator">3 * 3 * 5</gadget>
<output>45</output>

<result>45</result>