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 p2(N = 4000000):
a, b, ans = 1, 2, 0
while a < N:
if a % 2 == 0:
ans += a
a, b = b, a + b
return ans4613732