def fibseq():
    n0, n1 = 1, 2
    yield n0
    yield n1
    while 1:
        n0, n1 = n1, n0+n1
        yield n1

def main():

    MAX = 1000000
    count = 0

    for n in fibseq():
        if n > MAX:
            break
        if n % 2 == 0:
            count += n

    return count

if __name__ == '__main__':
    print main()