The pancake pan can only bake two cakes at a time, and both sides need to be baked, and each side takes 2 minutes. Mom bakes 7 cakes, how many minutes does it take at least.
烙饼锅每次只能烙两张饼，两面都要烙，每面需2分钟，妈妈烙7张饼，至少需多少分钟．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

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

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

<result>14</result>