Task
Time limit: 1000 ms,
Memory limit: 256 Mb

Write a program for calculating \(y\) according to he formula:
\(\begin{equation*} y(x) = \begin{cases} 0 &\text{x = 0}\\ x^2-x-1 &\text{in other cases} \end{cases} \end{equation*}\)
Input: integer \(x\)
Output\(y\)

Example
Input Output
1 2 1

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