Xiaohua uses a flat iron pan to bake pancakes, only 3 pancakes can be placed in the pan at the same time, and it takes 3 minutes to cook one side of the pancakes, but now it needs to bake 4 pancakes, how many minutes will it take at least.
小华用一只平底铁锅烙大饼，锅里只能同时放3只，烙熟大饼的一面需要3分钟，现在要烙4只大饼，最少需要多少分钟．
<gadget id="calculator">4 + 4</gadget>
<output>8</output>

<result>8</result>