Divide 52 by a number, leaving 4, then divide 40 by this number, leaving 4, what is the largest number?
用一个数去除52，余4，再用这个数去除40，也余4，这个数最大是多少？
<gadget id="calculator">2 * 2 * 3</gadget>
<output>12</output>

<result>12</result>