Xiao Ming goes to the park every 20 days, and Xiao Qiang goes to the park every 25 days. The two met in the park today. How many days at least do they meet again in the park?
小明每20天去一次公园，小强每25天去一次公园，今天两人在公园相遇，至少多少天他们又在公园相遇？
<gadget id="calculator">2 * 2 * 5 * 5</gadget>
<output>100</output>

<result>100</result>