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"""

Problem 20: https://projecteuler.net/problem=20

n! means n x (n - 1) x ... x 3 x 2 x 1

For example, 10! = 10 x 9 x ... x 3 x 2 x 1 = 3628800,

and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.

Find the sum of the digits in the number 100!

"""

from math import factorial

def solution(num: int = 100) -> int:

"""Returns the sum of the digits in the factorial of num

>>> solution(100)

648

>>> solution(50)

216

>>> solution(10)

>>> solution(5)

>>> solution(3)

>>> solution(2)

>>> solution(1)

"""

return sum(int(x) for x in str(factorial(num)))

if __name__ == "__main__":

print(solution(int(input("Enter the Number: ").strip())))

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