What is the value of (1+3+5+…+2013)-(2+4+6+…+2012)
(1+3+5+…+2013)-(2+4+6+…+2012)的值为多少
<gadget id="calculator">1 + 2_013</gadget>
<output>2_014</output>

<gadget id="calculator">2_013 - 1</gadget>
<output>2_012</output>

<gadget id="calculator">2_012 / 2</gadget>
<output>1_006</output>

<gadget id="calculator">1_006 + 1</gadget>
<output>1_007</output>

<gadget id="calculator">1_007 / 2</gadget>
<output>1_007/2 = around 503.5</output>

<gadget id="calculator">2_014 * (1_007/2)</gadget>
<output>1_014_049</output>

<gadget id="calculator">2_012 + 2</gadget>
<output>2_014</output>

<gadget id="calculator">2_012 - 2</gadget>
<output>2_010</output>

<gadget id="calculator">2_010 / 2</gadget>
<output>1_005</output>

<gadget id="calculator">1_005 + 1</gadget>
<output>1_006</output>

<gadget id="calculator">1_006 / 2</gadget>
<output>503</output>

<gadget id="calculator">2_014 * 503</gadget>
<output>1_013_042</output>

<gadget id="calculator">1_014_049 - 1_013_042</gadget>
<output>1_007</output>

<result>1_007</result>