document is 3600 words, Aunt Zhang typed (2/3) of the document, how many words are left?
一份文件3600字，张阿姨打了文件的(2/3)，还剩多少字没打？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3_600 * (1/3)</gadget>
<output>1_200</output>

<result>1_200</result>