Sep 4, 2013

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 solve(x, y, e, sum):
if (y > e):
return sum
if (y % 2 == 0):
sum += y
+ y, e, sum)
solve(y, x
print solve(0.1,4000000, 0)
```