The factorial is a positive integer n, denoted by n!, is the product of all positive integer less then or equal to n.

**For examle:**

5! = 5*4*3*2*1 = 123

The factorial value 5 is 24.

##### Program

n = int(input("Enter a number")) Factorial = 1 if n<1: print("if factorial does not exist of negative number") elif n==0: print ("The factorial of 0 is 1") else for i in range(1,n+1): factorial = factorial*i print("The factorial of",n,"is",factorial)