#  Even Fibonacci numbers
# 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 fibonacci(target):
    a = 1
    b = 2
    while a < target:
        yield a
        a, b = b, a + b

print("Problem 2 answer: ", sum([i for i in fibonacci(4000000) if i % 2 == 0]))

