The gift box is a cuboid, 12 cm long, 7 cm wide, and 6 cm high. How much wrapping paper is needed to wrap this box? (excluding losses)
礼物盒是长方体，长12厘米，宽7厘米，高6厘米．要给这个盒子包上包装纸，一共要多大的包装纸？(不计损耗)
<gadget id="calculator">12 * 7</gadget>
<output>84</output>

<gadget id="calculator">12 * 6</gadget>
<output>72</output>

<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<gadget id="calculator">84 + 72 + 42</gadget>
<output>198</output>

<gadget id="calculator">198 * 2</gadget>
<output>396</output>

<result>396</result>