Xiao Ming goes to the park to exercise every 4 days, and Xiao Hong goes to the same park to exercise every 6 days. After Xiao Ming and Xiao Hong go together, at least how many days will they go to the park to exercise together?
小明每隔4天去公园锻炼身体，小红每隔6天去同一个公园锻炼身体．小明和小红同去后最少几天再同去公园锻炼身体？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<result>35</result>