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21 lines
519 B
Python
21 lines
519 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. By starting with 1 and 2,
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the first 10 terms will be:
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1,2,3,5,8,13,21,34,55,89,..
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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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n = int(raw_input().strip())
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i=1
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j=2
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sum=0
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while(j<=n):
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if((j&1)==0): #can also use (j%2==0)
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sum+=j
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temp=i
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i=j
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j=temp+i
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print sum
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