The students went to the military area to perform, 113 students went to the fourth grade, 272 students went to the fifth grade, and 87 students went to the sixth grade. How many people go to the three grades?
同学们去军区演出，四年级去113人，五年级去272人，六年级去87人．三个年级一共去多少人？
<gadget id="calculator">113 + 272 + 87</gadget>
<output>472</output>

<result>472</result>