There are 245 students in the first grade, and 189 more students in the second grade than the first grade. How many students are there in the two grades?
一年级有学生245人，二年级比一年级多189人，两个年级一共有多少人？
<gadget id="calculator">245 + 189 + 245</gadget>
<output>679</output>

<result>679</result>