A pan can only bake two cakes at a time, and both sides of the cake need to be baked. It takes 2 minutes to bake each side, and how many minutes is the minimum time to bake seven cakes.
一个平底锅一次只能烙两张饼，饼的两面都要烙，每烙一面需要2分钟，烙七张饼至少要多少分钟．
<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">8 + 6</gadget>
<output>14</output>

<result>14</result>