Package for this problem was not updated by the problem writer or Codeforces administration after we’ve upgraded the judging servers. To adjust the time limit constraint, solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then value 800 ms will be displayed and used to determine the verdict.

The following languages are only available languages for the problems from the contest

Unknown Language Round #1:

- ActiveTcl 8.5

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A. Factorial

time limit per test

2 secondsmemory limit per test

64 megabytesinput

standard inputoutput

standard outputPrint the factorial of the given integer number *n*. The factorial of *n* is equal to 1·2·...·*n*.

Input

The only line contains *n* (1 ≤ *n* ≤ 10).

Output

Print the factorial of *n*.

Examples

Input

3

Output

6

Input

5

Output

120

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