Python/project_euler/problem_02/sol1.py
2018-10-19 17:14:25 -05:00

27 lines
650 B
Python

'''
Problem:
Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2,
the first 10 terms will be:
1,2,3,5,8,13,21,34,55,89,..
By considering the terms in the Fibonacci sequence whose values do not exceed n, find the sum of the even-valued terms.
e.g. for n=10, we have {2,8}, sum is 10.
'''
from __future__ import print_function
try:
raw_input # Python 2
except NameError:
raw_input = input # Python 3
n = int(raw_input().strip())
i=1
j=2
sum=0
while(j<=n):
if((j&1)==0): #can also use (j%2==0)
sum+=j
temp=i
i=j
j=temp+i
print(sum)