There are 8 teachers participating in the Children's Day activities, 56 students in the lower grades, and the number of students in the upper grades is three times that of the lower grades. How many students participated in the activities?
参加六一节活动的老师有8人，低年级学生有56人，高年级学生的人数是低年级的3倍，参加活动的学生有多少人？
<gadget id="calculator">56 * 3</gadget>
<output>168</output>

<gadget id="calculator">168 + 56</gadget>
<output>224</output>

<result>224</result>