16+15-14-13+12+11-10-9+8+7-6-5+4+3-2-1=how much.
16+15-14-13+12+11-10-9+8+7-6-5+4+3-2-1=多少．
<gadget id="calculator">15 - 14 - 13</gadget>
<output>-12</output>

<gadget id="calculator">11 - 10 - 9</gadget>
<output>-8</output>

<gadget id="calculator">7 - 6 - 5</gadget>
<output>-4</output>

<gadget id="calculator">3 - 2 - 1</gadget>
<output>0</output>

<gadget id="calculator">16 + (-12) + 12 + (-8) + 8 + (-4) + 4 + 0</gadget>
<output>16</output>

<result>16</result>