The length of a rectangle is 16 cm, the width is 1 cm, what is the circumference in cm?
长方形长16厘米，宽1厘米，周长多少厘米．
<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<gadget id="calculator">17 * 2</gadget>
<output>34</output>

<result>34</result>