△/d=30…12, what is the minimum value of △
△/d=30…12，△最小是多少
<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">13 * 30</gadget>
<output>390</output>

<gadget id="calculator">390 + 12</gadget>
<output>402</output>

<result>402</result>