3 small cubes are placed side by side in an open space, how many faces are exposed
3个小正方体并排摆在空地上，露在外面的面有多少个
<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">18 - 7</gadget>
<output>11</output>

<result>11</result>