The length, width and height of a cuboid are 7cm, 6cm and 3cm respectively, what is its surface area in cm**2.
长方体的长、宽、高分别是7cm、6cm、3cm，它的表面积是多少cm**2．
<gadget id="calculator">7 * 6</gadget>
<output>42</output>

<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">42 + 21 + 18</gadget>
<output>81</output>

<gadget id="calculator">81 * 2</gadget>
<output>162</output>

<result>162</result>