A carton for laptops is 40cm long, 25cm wide, and 35cm high. How many square centimeters of cardboard do you need to make this carton?
一个用来装笔记本电脑的纸箱，长是40cm，宽是25cm，高是35cm，做这个纸箱至少需要多少平方厘米的纸板？
<gadget id="calculator">40 * 25</gadget>
<output>1_000</output>

<gadget id="calculator">40 * 35</gadget>
<output>1_400</output>

<gadget id="calculator">25 * 35</gadget>
<output>875</output>

<gadget id="calculator">1_000 + 1_400 + 875</gadget>
<output>3_275</output>

<gadget id="calculator">3_275 * 2</gadget>
<output>6_550</output>

<result>6_550</result>