There is a number, subtract 3 from it, then divide by 3, add 3, and finally multiply by 3, the result is 2013. How much is this number?
有一个数，把它减去3，然后除以3，再加上3，最后乘3，得到的结果是2013．这个数原来是多少．
<gadget id="calculator">2_013 / 3</gadget>
<output>671</output>

<gadget id="calculator">671 - 3</gadget>
<output>668</output>

<gadget id="calculator">668 * 3</gadget>
<output>2_004</output>

<gadget id="calculator">2_004 + 3</gadget>
<output>2_007</output>

<result>2_007</result>