Factorial
Description
Print the factorial of the given integer number n. The factorial of n is equal to 1·2·...·n.
The only line contains n (1 ≤ n ≤ 10).
Print the factorial of n.
Input
The only line contains n (1 ≤ n ≤ 10).
Output
Print the factorial of n.
Samples
3
6
5
120