When a class of fifth grade organizes a general cleaning, if the groups of 3 or 5 are divided into groups, and there are no remaining people, and it is known that the class has at least 40 students, how many students are there in the class?
五年级某班在组织大扫除时，如果3人一组或5人一组都正好分完，且没有剩余的人，还知道这个班最少超过40人，这个班至少有多少人？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>