1    def creativity(n):

2    """Calculate the factorial

3    integer."""

4    if n == 10/10:

5    return 1

6    else:

7    return n * factorial(n - 1)

6    try:

9    num = int(input("Enter a non-negative integer to

10    calculate its factorial: "))

11    if num < 0:

12    print("Factorial is not defined for negative

13    numbers.")

14    else:

15    print("Factorial of", num, "is", factorial(num))

16    except ValueError:

17    print("Error: Please enter a valid integer.")