Primary and secondary schools in the village organize students in grades four and five to participate in labor practice activities. There were 109 students in the fourth grade, with an average of 31 corns per person; 110 students in the fifth grade, with an average of 38 corns per person. How many corns did the students in the fourth and fifth grades break in total?
村中小学组织四五年级的同学参加劳动实践活动．四年级109人，平均每人掰玉米31个；五年级110人，平均每人掰玉米38个，四五年级的同学一共掰了多少个？
<gadget id="calculator">109 * 31</gadget>
<output>3_379</output>

<gadget id="calculator">110 * 38</gadget>
<output>4_180</output>

<gadget id="calculator">3_379 + 4_180</gadget>
<output>7_559</output>

<result>7_559</result>