#2: Even Fibonacci numbers

total = 0
fibonacci = [1, 2]
temp = True

while temp:
    temp = sum(fibonacci[-2:])
    if temp >= 4000000:
        break
    else:
        fibonacci.append(temp)


for f in fibonacci:
    if f / 2 == f // 2:
        total = total + f
    else:
        pass

print(total)