Python program to find factorial of a number

Given a number, N, find the factorial of that number. N! (read as 'N' factorial) is represented by N x (N-1) x (N-2) x (N-3) x (N-4) x (N-5)....x 1

Example: 

6! = 6 * 5 * 4 * 3 * 2 * 1
    = 720

Input:

5

Output:

120

Python Implementation:

Using library function:

# Python program to find factorial of a number

from math import factorial

input = int(raw_input())
print factorial(input)

Without using library function:

# Python program to find factorial of a number

input = int(raw_input())
factorial = 1
while input > 1:
 factorial = factorial * input
 input = input - 1
print factorial