A photo is 5 cm long and 3 cm wide, with a frame around it, how many centimeters is the frame around.
一张照片长5厘米，宽3厘米，在它的四周镶上边框，边框一周长多少厘米．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 2</gadget>
<output>16</output>

<result>16</result>