During the summer vacation, the three students go to the library to read books every 5 days, B once every 4 days, and C once every 6 days. Then after the three people met for the first time, at least how many days will they meet again in the library?
暑假里，三位同学每隔不同的天数到图书馆看书，甲5天去一次，乙4天去一次，丙6天去一次．那么三人第一次碰面后，至少再多少天又在图书馆相见？
<gadget id="calculator">5 * 2 * 2 * 3</gadget>
<output>60</output>

<result>60</result>