Python/project_euler/problem_01/sol4.py

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"""
Problem Statement:
If we list all the natural numbers below 10 that are multiples of 3 or 5,
we get 3,5,6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below N.
"""
from __future__ import print_function
try:
raw_input # Python 2
except NameError:
raw_input = input # Python 3
def solution(n):
"""Returns the sum of all the multiples of 3 or 5 below n.
>>> solution(3)
0
>>> solution(4)
3
>>> solution(10)
23
>>> solution(600)
83700
"""
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xmulti = []
zmulti = []
z = 3
x = 5
temp = 1
while True:
result = z * temp
if result < n:
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zmulti.append(result)
temp += 1
else:
temp = 1
break
while True:
result = x * temp
if result < n:
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xmulti.append(result)
temp += 1
else:
break
collection = list(set(xmulti + zmulti))
return sum(collection)
if __name__ == "__main__":
print(solution(int(raw_input().strip())))