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51007 - Function f(x)

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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
by Emre Sertel.

Write a program that reads a real value x and calculates the function below:

Input
The input contains a real number x and x (10^-16 ≤ x ≤ 10¹⁶).
Output
The output should contain one number which is the answer to the question.

Input	Output
5	0.2
-20	-17

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