######################################################################
# 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 factorial(x):
    if x is 1:
        return x
    else:
        return x * factorial(x - 1)


number = str(factorial(100))
sum = 0

for c in number:
    sum += int(c)

print(sum)

# Solution: