# 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.
import time
t0 = time.time()
i = 1
j = 2
sum = 2
while j <= 4000000:
i, j = j, i + j
if j % 2 == 0:
sum += j
print(sum)
t1 = time.time()
print "Process usage", t1 - t0