31 children want to cross the river by boat, there is only one boat by the river, only 6 people can sit on it each time, at least how many times can everyone cross the river?
31个小朋友要坐船过河，河边只有一条船，穿上每次最多只能坐6人，至少几次才能使大家全部过河？
<gadget id="calculator">31 - 6</gadget>
<output>25</output>

<gadget id="calculator">25 / 5</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>