# QUESTION: 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(n):
    if(n <= 2):
        return n

    else:
        return(fibonacci(n-1) + fibonacci(n-2))

limit = 4000000
i = 0
answer = 0
while fibonacci(i)<= limit:
    if fibonacci(i)%2 == 0:
        answer += fibonacci(i)
    i+=1

print(answer)
