Xiao Wang, Xiao Li and Xiao Zhang regularly go to Grandma Wang's house to clean. Xiao Li goes there every other day, Xiao Wang and Xiao Zhang go there every two days and three days respectively. After the three of them cleaned together for the first time, how many days will it be before the next cleaning at the same time?
小王、小李和小张定期到王奶奶家打扫卫生．小李隔1天去一次，小王、小张分别每隔2天、3天去一次．他们第一次三人同去打扫后，下一次同时去打扫将相隔多少天？
<gadget id="calculator">1 + 1 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>