# 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.

a=1
b=2
total=2
c=0

while c < 4000000:
	c = a + b
	if c%2==0:
		total +=c
	a=b
	b=c
	
print total

