A rectangle with a width of 3 cm and a length of 4 cm is surrounded by a piece of iron wire. What is the minimum length of the wire in cm?
用一根铁丝围成一个宽是3厘米，长是4厘米的长方形，这根铁丝至少长多少厘米．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>