1+2+3+... 78．
1+2+3+…78．
<gadget id="calculator">1 + 78</gadget>
<output>79</output>

<gadget id="calculator">78 / 2</gadget>
<output>39</output>

<gadget id="calculator">79 * 39</gadget>
<output>3_081</output>

<result>3_081</result>