__author__ = 'harineem'
#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 four million,
# find the sum of the even-valued terms.
a = 1
b = 2
c=0
tot = 0
while b<4000000 :
    if b%2 ==0 :
        tot +=b
    c = a
    a = b
    b =  c+b
print(tot)





