Euler 002

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
      solve(y, x + y, e, sum)

print solve(0.1,4000000, 0)