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35 lines
669 B
Python
35 lines
669 B
Python
"""
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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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def solution(n):
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"""Returns the sum of all the multiples of 3 or 5 below n.
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>>> solution(3)
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0
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>>> solution(4)
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3
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>>> solution(10)
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23
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>>> solution(600)
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83700
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"""
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a = 3
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result = 0
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while a < n:
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if a % 3 == 0 or a % 5 == 0:
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result += a
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elif a % 15 == 0:
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result -= a
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a += 1
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return result
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if __name__ == "__main__":
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print(solution(int(input().strip())))
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