Problem 1042. -- N!

HDU_1042: N!

Time Limit: 5000 MS  Memory Limit: 32 MB   64bit IO Format: %I64d
Submitted: 73  Accepted: 16
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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

1
2
3

Sample Output

1
2
6

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