In the division formula x/30=20...y, what is x when y is the largest
在除法算式x/30=20…y中，y最大时，x是多少
<gadget id="calculator">20 * 30</gadget>
<output>600</output>

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

<gadget id="calculator">600 + 29</gadget>
<output>629</output>

<result>629</result>