Zhang Jia goes to the park to exercise every 3 days, and Li Yang goes to the park to exercise every 4 days. The two of them exercised together in the park today. How many days will it take for them to come to the park to exercise together again?
张佳每3天去公园锻炼一次，李阳每4天去公园锻炼一次，今天他们两人在公园里一起锻炼了，他们最少还要再隔几天才能再次一起来公园锻炼？
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>