Use a pan to pancake, you can put 3 pancakes at a time, and fry for 1 minute on each side. If there are 4 cakes, both sides must be fried, at least how many minutes.
用一个平底锅煎饼，每次可以放3张饼，每面要煎1分钟．如果有4张饼，两面都要煎，至少要多少分钟．
<gadget id="calculator">1 + 1 + 1</gadget>
<output>3</output>

<result>3</result>