You can fry up to 3 fish at a time. Both sides of the fish must be fried. It takes 2 minutes to fry one side, and how many minutes is the minimum time to fry 6 fish.
一次最多能煎3条鱼，鱼的两面都要煎，煎一面要2分钟，煎6条鱼最少要多少分钟．
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<result>8</result>