In the love activity, the third grade students donated a total of 350 yuan, which was 80 yuan less than the fourth grade students. How much did the third and fourth grade students donate in total?
在献爱心活动中三年级同学一共捐款350元，比四年级同学少捐80元，三、四年级同学一共捐款多少元？
<gadget id="calculator">350 + 80 + 350</gadget>
<output>780</output>

<result>780</result>