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. If the joint of the label paper is 4 cm, what is the area of the 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，如果商标纸的接头处是4厘米，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>

<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<gadget id="calculator">2_100 + 120</gadget>
<output>2_220</output>

<result>2_220</result>