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class Solution(object):
    def maxProfit(self, prices):
        """
        :type prices: List[int]
        :rtype: int
        """
        if len(prices) <= 1:
            return 0
        sum = 0
        for i in range(1,len(prices)):
            if prices[i] > prices[i-1]:
                sum += prices[i] - prices[i-1]
        return sum