How many square meters of glass is needed to make a glass fish tank without a cover with a length of 8 decimeters, a width of 5 decimeters, and a height of 4 decimeters?
制作一个长8分米，宽5分米，高4分米的无盖玻璃鱼缸，至少需要多少平方米的玻璃？
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">8 * 4 * 2</gadget>
<output>64</output>

<gadget id="calculator">5 * 4 * 2</gadget>
<output>40</output>

<gadget id="calculator">40 + 64 + 40</gadget>
<output>144</output>

<result>144</result>