There are some apples in the box, put 4 apples in each plate, and the remaining ones are not enough to fit 1 plate, what is the maximum number of apples left.
箱子里有一些苹果，每盘放4个，最后剩下的不够放1盘，最多剩下多少个个苹果．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<result>3</result>