Calculation: -3-(-6)-9-(-12)-15-(-18)-…-2013-(-2016).
计算：-3-(-6)-9-(-12)-15-(-18)-…-2013-(-2016)．
<gadget id="calculator">(-336) * 1_008</gadget>
<output>-338_688</output>

<gadget id="calculator">336 * 1_011</gadget>
<output>339_696</output>

<gadget id="calculator">(-338_688) + 339_696</gadget>
<output>1_008</output>

<result>1_008</result>