2013+2012-2011-2010+2009+2008-2007-2006+2005+2004-2003-2001+2001+9+8-7-6+5+4-3-2+1=how much $\\end{ array} $.
2013+2012-2011-2010+2009+2008-2007-2006+2005+2004-2003-2001+2001+9+8-7-6+5+4-3-2+1=多少$\\end{array}$．
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 + 2_001 + 1</gadget>
<output>2_022</output>

<result>2_022</result>