(13+13*2+13)*25．
(13+13*2+13)*25．
<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<gadget id="calculator">13 + 26 + 13</gadget>
<output>52</output>

<gadget id="calculator">52 * 25</gadget>
<output>1_300</output>

<result>1_300</result>