Calculation: 2013/(9/18)/(18/54)/(54/63)=how much.
计算：2013/(9/18)/(18/54)/(54/63)=多少．
<gadget id="calculator">9 / 18</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">18 / 54</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">54 / 63</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">2_013 / (1/2) / (1/3) / (6/7)</gadget>
<output>14_091</output>

<result>14_091</result>