There is a pile of apples, 217 are divided into class 3 and 1, 196 are lost in class 3 and 2, and there are 15 left. How many apples are there in this pile?
有一堆苹果，三1班分掉217只，三2班分掉196只，还剩下15只，这堆苹果有多少只？
<gadget id="calculator">217 + 196 + 15</gadget>
<output>428</output>

<result>428</result>