There are 30 children in the big class of the kindergarten. The teacher must distribute at least how many toys to everyone, so as to ensure that there is always a child who can get at least 2 toys.
幼儿园大班有30个小朋友，老师最少要拿多少件玩具分给大家，才能保证总有一个小朋友至少能得到2件玩具．
<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<result>31</result>