codeforces#P1505F. Math

Math

Description

*The two images are equivalent, feel free to use either one.

The input contains a single integer $a$ ($-100 \le a \le 100$).

Output the result – an integer number.

Input

The input contains a single integer $a$ ($-100 \le a \le 100$).

Output

Output the result – an integer number.

Samples

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