import ast class Solution(object):

def maxSubArray(self, nums):
    """
    :type nums: List[int]
    :rtype: int
    """
    for i in range(1, len(nums)):#range使用方法：range(start,stop[,step])
        nums[i]= nums[i] + max(nums[i-1], 0)
    return max(nums)

obj = ast.literal_eval(input()) use1 = Solution() print(use1.maxSubArray(obj))