There are 291 students in the third grade of Songyang Second Primary School, and 19 more students in the fourth grade than in the third grade. How many students are there in the third and fourth grades?
嵩阳二小三年级有291人，四年级的人数比三年级的人数多19人，三年级和四年级一共有多少人？
<gadget id="calculator">291 + 19 + 291</gadget>
<output>601</output>

<result>601</result>