def main():
s, i, n = 0, 0, -1
while n < 4000000:
n, i = fibonacci(i), i + 1
if n % 2 == 0:
s += n
print s
return 0
def main():
i = 0
while len(str(fibonacci(i))) < 1000:
i += 1
print i - 1
return 0
