# 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.

def main():
    a = 1
    b = 2
    sum = 2 # ignore 1 as it is odd
    c= 0
    while c<4000000:
        c = a+b
        a=b
        b=c
        if (c%2 is 0):
            sum = sum +c
    
    print sum

main()
