A box of biscuits is 20 centimeters long, 15 centimeters wide and 30 centimeters high. Now it is necessary to stick label paper around it. What is the area of this label paper in square centimeters?
一盒饼干长20厘米，宽15厘米，高30厘米，现在要在它的四周贴上商标纸，这张商标纸的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>