A cuboid fish tank is 40 cm long, 30 cm wide, and 35 cm high. How many square centimeters of glass do you need to make such a glass fish tank?
一个长方体鱼缸，长40厘米，宽30厘米，高35厘米．做这样一个玻璃鱼缸需要玻璃多少平方厘米？
<gadget id="calculator">40 * 30</gadget>
<output>1_200</output>

<gadget id="calculator">40 * 35 * 2</gadget>
<output>2_800</output>

<gadget id="calculator">30 * 35 * 2</gadget>
<output>2_100</output>

<gadget id="calculator">1_200 + 2_800 + 2_100</gadget>
<output>6_100</output>

<result>6_100</result>