Make a frame for a picture with a circumference of 142cm and a width of 29cm. What is the minimum length of the frame in cm.
给周长是142cm，宽29cm的画做画框．画框的长至少是多少cm．
<gadget id="calculator">142 / 2</gadget>
<output>71</output>

<gadget id="calculator">71 - 29</gadget>
<output>42</output>

<result>42</result>