4□8/4, if there is 0 in the middle of the quotient, and there is no remainder, then the maximum number should be filled in □.
4□8/4，要使商中间有0，且没有余数，那么□里最大应填多少．
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<result>2</result>