sol4

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    """
    n! means n × (n − 1) × ... × 3 × 2 × 1
    
    For example, 10! = 10 × 9 × ... × 3 × 2 × 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!
    """
    
    
    def solution(n):
        """Returns the sum of the digits in the number 100!
        >>> solution(100)
        648
        >>> solution(50)
        216
        >>> solution(10)
        27
        >>> solution(5)
        3
        >>> solution(3)
        6
        >>> solution(2)
        2
        >>> solution(1)
        1
        """
        fact = 1
        result = 0
        for i in range(1, n + 1):
            fact *= i
    
        for j in str(fact):
            result += int(j)
    
        return result
    
    
    if __name__ == "__main__":
        print(solution(int(input("Enter the Number: ").strip())))