A frying pan can hold two cakes at the same time. A cake has two sides, and it takes 1 minute to cook one side. How long does it take at least five pancakes to cook?
一个平底锅，每次同时能放两张饼．一张饼有两个面，煎熟一面要用1分钟．煎熟五张饼至少需要多少分钟．
<gadget id="calculator">1 * 3</gadget>
<output>3</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<result>5</result>