In the tree planting activity, there were 372 people in the first grade, and 83 people in the second grade participated in it. How many people in the first and second grades participated?
在植树活动中，一年级有372人参加，二年级参加的人数比一年级少83人，一、二年级共有多少人参加？
<gadget id="calculator">372 - 83</gadget>
<output>289</output>

<gadget id="calculator">372 + 289</gadget>
<output>661</output>

<result>661</result>