25+26-12-13+27+28-14-15+29+30-16-17=how many.
25+26-12-13+27+28-14-15+29+30-16-17=多少．
<gadget id="calculator">26 - 12 - 13</gadget>
<output>1</output>

<gadget id="calculator">28 - 14 - 15</gadget>
<output>-1</output>

<gadget id="calculator">30 - 16 - 17</gadget>
<output>-3</output>

<gadget id="calculator">25 + 1 + 27 + (-1) + 29 + (-3)</gadget>
<output>78</output>

<result>78</result>