Problem: You have been given a positive integer N. You need to find and print the Factorial  of this number. The Factorial of a positive integer N refers to the product of all number in the range from 1 to N. You can read more about the factorial of a number here.

Input Format:
The first and only line of the input contains a single integer N denoting the number whose factorial you need to find. 

Output Format
Output a single line denoting the factorial of the number N.

Constraints
 1 ≤ N ≤ 10   

SAMPLE INPUT
2

SAMPLE OUTPUT
2

Solution (in PYTHON):

Solution:
n = int(input())
fact= 1
if n < 0:
   print "Wrong input"
elif n == 0:
   print "The factorial of 0 is 1"
else:
   for i in range(1,n + 1):
       fact = fact*i
   print fact