What is the surface area of a cuboid container without a cover whose length, width and height are 1.5 meters, 2 meters and 4 meters respectively?
长、宽、高分别是1.5米，2米，4米的无盖长方体容器，它的表面积是多少．
<gadget id="calculator">1.5 * 2</gadget>
<output>3</output>

<gadget id="calculator">1.5 * 4 * 2</gadget>
<output>12</output>

<gadget id="calculator">2 * 4 * 2</gadget>
<output>16</output>

<gadget id="calculator">3 + 12 + 16</gadget>
<output>31</output>

<result>31</result>