There are 6 students in a row facing the south station, and only 5 students can turn backward at a time, how many times can the 6 students face the north at least.
有6个学生都面向南站成一行，每次只能有5个学生向后转，则最少要做多少次能使6个学生都面向北．
<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>