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19 lines
505 B
Python
19 lines
505 B
Python
'''
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Problem:
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Each new term in the Fibonacci sequence is generated by adding the previous two terms.
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0,1,1,2,3,5,8,13,21,34,55,89,..
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Every third term from 0 is even So using this I have written a simple code
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By considering the terms in the Fibonacci sequence whose values do not exceed n, find the sum of the even-valued terms.
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e.g. for n=10, we have {2,8}, sum is 10.
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'''
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"""Python 3"""
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n = int(input())
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a=0
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b=2
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count=0
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while 4*b+a<n:
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a, b = b, 4*b+a
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count+= a
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print(count+b)
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