def fib(n):
	if n == 1:
		return 1
	if n == 2:
		return 2
		
	return fib(n-1) + fib(n-2)

total = 0
count = 0
while True:
	count += 1
	result = fib(count)

	if (result % 2) != 0:
		continue
	
	if result > 1000000:
		break

	total += result

print total