The students in Class 1, Grade 5 are divided into groups to sweep snow. There is one student in a group of 2, one student in a group of 3, and one student in a group of 5. How many students are there at least in this class?
五年级一班的学生分组扫雪，2人一组余1人，3人一组余1人，5人一组也余1人，这个班至少有多少人？
<gadget id="calculator">2 * 3 * 5</gadget>
<output>30</output>

<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<result>31</result>