A cuboid biscuit cylinder has a length and width of 20 cm and a height of 30 cm. If a circle of trademark paper is pasted around it (not on the top and bottom), what is the minimum area of the trademark paper in square centimeters?
一个长方体的饼干筒，长和宽都是20厘米，高30厘米．如果围着它贴一圈商标纸(上下面不贴)，这个商标纸的面积至少有多少平方厘米？
<gadget id="calculator">20 * 30 * 4</gadget>
<output>2_400</output>

<result>2_400</result>