cuboid glass goldfish tank without a cover is 60 cm long, 36 cm wide and 30 cm high. How many square centimeters of glass should be used to make such a fish tank?
一种无盖的长方体玻璃金鱼缸，长60厘米，宽36厘米，高30厘米，做一个这样的鱼缸至少要用玻璃多少平方厘米？
<gadget id="calculator">60 * 36</gadget>
<output>2_160</output>

<gadget id="calculator">60 * 30</gadget>
<output>1_800</output>

<gadget id="calculator">36 * 30</gadget>
<output>1_080</output>

<gadget id="calculator">2_160 + 1_800 + 1_080</gadget>
<output>5_040</output>

<gadget id="calculator">5_040 * 2</gadget>
<output>10_080</output>

<gadget id="calculator">10_080 - 2_160</gadget>
<output>7_920</output>

<result>7_920</result>