Compute Factorial

Given a non-negative integer \( n \), calculate its factorial.

The factorial of \( n \) is denoted as \( n! \) and defined as follows:

• \( 0! = 1 \)
• For \( n \ge 1,\; n! = n \times (n-1) \times \cdots \times 1 \)

If \( n \) is negative, the program should output "Error".

inputFormat

The input consists of a single integer \( n \) provided through standard input.

outputFormat

Output the factorial of \( n \) if \( n \) is non-negative. Otherwise, output "Error".

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