The fifth grade students participate in science and technology group activities. If there are 9 people in each group, there will be an extra 6 people, and if there are 8 people in each group, there will be an extra 5 people. How many students are there at least to participate in the science and technology group activities?
五年级同学参加科技小组活动，如果每组9人则多6人，如果每组8人则多5人，参加科技小组活动的同学至少有多少人？
<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<gadget id="calculator">72 - 3</gadget>
<output>69</output>

<result>69</result>