A square with a side length of 4 meters is surrounded by a wire, and there are 3 meters left, how long is the wire in meters?
用一根铁丝围成一个边长4米的正方形，还余下3米，这根铁丝长多少米米．
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">16 + 3</gadget>
<output>19</output>

<result>19</result>