The fifth grade students of the primary school of Dongchen International School lined up to do exercises. Line up in groups of 5, 7, and 12, and all of them are just finished. How many students are there at least in this grade?
东辰国际学校小学部五年级学生排队做操．按5人一组，7人一组，12人一组排队，都恰好分完，这个年级至少有多少学生？
<gadget id="calculator">5 * 7 * 12</gadget>
<output>420</output>

<result>420</result>