Factorials

Background:

The factorial of n, (written as n!) is n * (n - 1) * (n - 2) * ... * 2 * 1. 0! = 1 (go lookup the Gamma function to find out why). In this problem, you'll be calculating the factorial of an integer between 0 and 100. 100! has no more than 200 digits.

Input:

There are 1 or more lines of input. Each line has a single integer, N, on it, such that 0 <= N <= 100.

Output:

For each line of input, your program should print out N!.

Sample Input:

8
50

Sample Output:

40320
30414093201713378043612608166064768844377641568960512000000000000