There is a pillowcase with a length of 60 cm and a width of 40 cm. Now add lace to the pillowcase. The length of the lace is twice the circumference of the pillowcase. How long is the lace required for this pillowcase?
有一个枕套长60厘米，宽40厘米，现在给枕套加上花边，花边的长度是枕套周长的2倍，问这个枕套需要多长的花边？
<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">100 * 2 * 2</gadget>
<output>400</output>

<result>400</result>