Xiaobao draws lace around the hand-copied newspaper. The hand-copied newspaper is 42 cm long and 28 cm wide. How many centimeters is the lace of the hand-copied newspaper?
小宝沿手抄报四周画花边，手抄报长42厘米，宽28厘米，手抄报的花边长多少厘米．
<gadget id="calculator">42 + 28</gadget>
<output>70</output>

<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<result>140</result>