To make a rectangular golden cylinder without a cover, which is 8 meters long, 6 meters wide and 7 meters high, what is the minimum level of glass required?
做一个无盖的长方金缸，长8米，宽6米，高7，至少需玻璃多少平？
<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">8 * 7 * 2</gadget>
<output>112</output>

<gadget id="calculator">6 * 7 * 2</gadget>
<output>84</output>

<gadget id="calculator">48 + 112 + 84</gadget>
<output>244</output>

<result>244</result>