2018-10-19 07:48:28 -05:00
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'''
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Problem Statement:
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If we list all the natural numbers below 10 that are multiples of 3 or 5,
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we get 3,5,6 and 9. The sum of these multiples is 23.
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Find the sum of all the multiples of 3 or 5 below N.
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'''
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from __future__ import print_function
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try:
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raw_input # Python 2
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except NameError:
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raw_input = input # Python 3
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n = int(raw_input().strip())
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2019-05-25 15:41:24 +02:00
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print(sum([e for e in range(3, n) if e % 3 == 0 or e % 5 == 0]))
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