The pancake pan can only bake two cakes at a time, both sides are baked, and each side takes 1 minute. Mom bakes 4 cakes, how many minutes does it take at least.
烙饼锅每次只能烙两张饼，两面都烙，每面需1分钟，妈妈烙4张饼，至少需要多少分钟．
<gadget id="calculator">2 * 1 * 2</gadget>
<output>4</output>

<result>4</result>