After typing a manuscript, there are still 2400 characters after typing (1/3). How many characters are there in this manuscript?
打一份稿件，打了(1/3)后还有2400个字，这份稿件共有多少个字．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">2_400 / (2/3)</gadget>
<output>3_600</output>

<result>3_600</result>