There is a piece of cardboard with a length of 40 cm and a width of 30 cm. After cutting out a square of the same size on each of the four corners, a cuboid box is prepared. What is the perimeter of the cardboard after being cut in centimeters?
有一张长40厘米，宽30厘米的硬纸板，在四个角上各剪去一个同样大小的正方形后准备做一个长方体纸盒，被剪后硬纸板的周长是多少厘米．
<gadget id="calculator">40 + 30</gadget>
<output>70</output>

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

<result>140</result>