A goldfish tank whose length, width and height are 60 centimeters, 50 centimeters and 40 centimeters respectively should be covered with a layer of colored paper. How many square decimeters of colored paper are needed at least?
一个长、宽、高分别是60厘米、50厘米、40厘米的金鱼缸，四周要贴上一层彩色纸，至少需要彩色纸多少平方分米？
<gadget id="calculator">60 * 40</gadget>
<output>2_400</output>

<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">2_400 + 2_000</gadget>
<output>4_400</output>

<gadget id="calculator">4_400 * 2</gadget>
<output>8_800</output>

<result>8_800</result>