2+{3+(4+(5*6)*7)*8}*9=how much.
2+{3+(4+(5*6)*7)*8}*9=多少．
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 * 7</gadget>
<output>210</output>

<gadget id="calculator">4 + 210</gadget>
<output>214</output>

<gadget id="calculator">214 * 8</gadget>
<output>1_712</output>

<gadget id="calculator">3 + 1_712</gadget>
<output>1_715</output>

<gadget id="calculator">1_715 * 9</gadget>
<output>15_435</output>

<gadget id="calculator">2 + 15_435</gadget>
<output>15_437</output>

<result>15_437</result>