2006+2005-2004-2003+2002+2001-2000-1999+...+10+9-8-7+6+5-4-3+2=how much.
2006+2005-2004-2003+2002+2001-2000-1999+…+10+9-8-7+6+5-4-3+2=多少．
<gadget id="calculator">2_006 - 2</gadget>
<output>2_004</output>

<gadget id="calculator">2_004 / 4</gadget>
<output>501</output>

<gadget id="calculator">501 * 4</gadget>
<output>2_004</output>

<gadget id="calculator">2_004 + 2</gadget>
<output>2_006</output>

<result>2_006</result>