Students in Class 5 and 1 are divided into groups for rope-knotting competitions at the Shanqing World Practice Base. Every group of 4 people, every group of 5 people or every group of 6 people, there is no surplus. At least how many students are there in Class 51.
五1班的同学在山青世界实践基地分小组结绳比赛，每4人一组，每5人一组或每6人一组，都没有剩余，五1班学生至少有多少人．
<gadget id="calculator">2 * 2 * 3 * 5</gadget>
<output>60</output>

<result>60</result>