△/30=12…☆, what is the largest dividend.
△/30=12…☆，被除数最大是多少．
<gadget id="calculator">12 * 30</gadget>
<output>360</output>

<gadget id="calculator">30 - 1</gadget>
<output>29</output>

<gadget id="calculator">360 + 29</gadget>
<output>389</output>

<result>389</result>