Calculation: (2+4+6+...+2012)-(1+3+5+...+2011)=how much.
计算：(2+4+6+…+2012)-(1+3+5+…+2011)=多少．
<gadget id="calculator">2_012 - 2_011</gadget>
<output>1</output>

<gadget id="calculator">1 * 1_006</gadget>
<output>1_006</output>

<result>1_006</result>