A cuboid biscuit box is 20cm long, 10cm wide, and 5cm high. If a circle of trademark paper is pasted around it (not above and below), how many square centimeters should the area of this trademark paper be at least?
一个长方体的饼干盒，长20cm，宽10cm，高5cm．如果围着它贴一圈商标纸(上下面不贴)，这张商标纸的面积至少要多少平方厘米？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<result>300</result>