Students participate in the running competition. There are 5 students in each group or 2 students in each group of 7 students. At least how many students participate in the running competition?
学生参加跑步比赛，每组5人或每组7人都余2人，参加跑步的至少有多少人？
<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">35 + 2</gadget>
<output>37</output>

<result>37</result>