Factorial Computation

Given a non-negative integer \( n \), compute its factorial \( n! \). The factorial is defined as:

\( n! = \begin{cases} 1, & n = 0 \\ n \times (n-1)! & n > 0 \end{cases} \)

For example, \( 4! = 24 \) and \( 5! = 120 \). You must read the input from standard input and output the result to standard output.

inputFormat

The input consists of a single non-negative integer \( n \) (\( 0 \leq n \leq 20 \)). The integer is provided on a single line.

outputFormat

Output a single integer representing the factorial of \( n \).

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