p2.py

"""


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=1
sum=0
while b <= 4000000:
    t=b
    b=a+b
    a=t

    if b%2 == 0:
        sum=sum+b
print(sum)