A biscuit box is 30 cm long, 25 cm wide, and 40 cm high. A layer of label paper is pasted around it (excluding the upper and lower sides). What is the minimum area of this label paper?
一个饼干盒，长30厘米，宽25厘米，高40厘米，在它的四周(不包括上下两个面)贴一层商标纸，这张商标纸的面积至少是多少．
<gadget id="calculator">30 * 25</gadget>
<output>750</output>

<gadget id="calculator">25 * 40</gadget>
<output>1_000</output>

<gadget id="calculator">750 + 1_000</gadget>
<output>1_750</output>

<gadget id="calculator">1_750 * 2</gadget>
<output>3_500</output>

<result>3_500</result>