A pan can bake two cakes at a time, and each cake needs 3 points on the front and back sides. So how many points is the minimum required to bake 3 cakes.
一只平底锅每次可以烙两张饼，每张饼正反面各需3分．那么烙3张饼最少需要多少分．
<gadget id="calculator">3 + 3 + 3</gadget>
<output>9</output>

<result>9</result>