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# ## Factorial digit sum
#
#
#
# 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!
#

# +
# %%time

import math

number = math.factorial(100)
textnum = str(number)
mysum = 0
for char in textnum:
    mysum = mysum + int(char)
    
print(mysum)
# -



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