Calculation: 2011+2010+2009-2008-2007-2006+2005+2004+2003-2002-2001-2000+...-8+7+6+5-4-3-2+1.
计算：2011+2010+2009-2008-2007-2006+2005+2004+2003-2002-2001-2000+…-8+7+6+5-4-3-2+1．
<gadget id="calculator">1_005 * 3</gadget>
<output>3_015</output>

<gadget id="calculator">3_015 + 1</gadget>
<output>3_016</output>

<result>3_016</result>