Question: in python For a positive integer n let's define a function f: f(n)=-1+2-3+..+n*(-1)^n Your task is to calculate f(n) for a given integer n. Input

in python

For a positive integer n let's define a function f: f(n)=-1+2-3+..+n*(-1)^n Your task is to calculate f(n) for a given integer n.

Input The single line contains the positive integer n.

Output Print f(n) in a single line.

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