import itertools
import sys


def run(nums):
    best = 0
    for i in xrange(len(nums)):
        if nums[i] % 2 == 1:
            cur_best = nums[i]
            if cur_best > best: best = cur_best
            for j in xrange(i + 1, len(nums)):
                if nums[j] % 2 == 0:
                    break
                cur_best += nums[j]
                if cur_best > best:
                    best = cur_best
    print best

for line in sys.stdin:
    nums = [int(i) for i in line.strip().split()]
    run(nums)