Y by Davi-8191, Amir Hossein, megarnie, Adventure10, Mango247
Find all functions
such that
where 

![\[f(f(n))=n+2015\]](http://latex.artofproblemsolving.com/0/b/7/0b7a938bb115995f41967b0fca3caf36c48cbaee.png)

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