Factorial Calculation

Given a positive integer n, compute the nth term of the sequence defined by:

\(a_1 = 1\) and \(a_n = a_{n-1} \times n\) for \(n > 1\), i.e., the factorial of n.

Your task is to write a program that reads an integer n from standard input and outputs \(n!\) to standard output.

Note: It is guaranteed that \(n \ge 1\). For example, when n = 5, the output should be 120.

inputFormat

The input consists of a single integer n (\(n \ge 1\)) provided via standard input.

outputFormat

Output the factorial of n (i.e., \(n!\)) to standard output.

## sample

3

6

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