When Xiao Ming did an addition, he regarded the 2 in the ones digit of one addend as 4, and the 7 in the ones digit of the other addend as 9, and the calculated sum was 215. What is the correct sum?
小明在做一道加法时，把一个加数个位上的2看作了4，另一个加数个位上的7看作9，结果计算的和为215．正确的和为多少？
<gadget id="calculator">215 - 4</gadget>
<output>211</output>

<result>211</result>