N! Plus

Time Limit:1000MS  Memory Limit:65535KB
Description:
Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!.
Input:
One N in one line.
Output:
For each N, output N! in one line.
 
Sample test:
Input
3
Output
6
Note:
Source:
Author:
ACSolo