Problem1441--N!

1441: N!

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Time Limit : 5.000 sec  Memory Limit : 262 MB

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Description

Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!

Input

One N in one line, process to the end of file.

Output

For each N, output N! in one line.

Sample Input Copy

1
2
3

Sample Output Copy

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6

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