The fifth grade students of Yucai Primary School are divided into groups of five or six in the tree planting activities. How many students in the fifth grade at least participate in the tree planting activities?
育才小学五年级学生在植树活动中，每五人一组或6人一组都正好分完，五年级至少有多少学生参加植树活动？
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>