A biscuit box is 20 cm long, 15 cm wide, and 30 cm high. Label paper is to be pasted around it. What is the surface area of this label paper in square centimeters?
一个饼干盒长20厘米，宽15厘米，高30厘米，要在它的四周贴上商标纸，这张商标纸的表面积是多少平方厘米？
<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<gadget id="calculator">15 * 30</gadget>
<output>450</output>

<gadget id="calculator">600 + 450</gadget>
<output>1_050</output>

<gadget id="calculator">1_050 * 2</gadget>
<output>2_100</output>

<result>2_100</result>