def maxProfit(prices):
        """
        :type prices: List[int]
        :rtype: int
        """
        profit = 0
        for i in range(len(prices)):
            # print(i)
            if i+1 == len(prices):
                break
            if prices[i] < prices[i+1]:
                # print(i)
                # print('hit')
                profit += prices[i+1] - prices[i]
                # print(profit)
        return profit

maxProfit([7,1,5,3,6,4]) 
# maxProfit([7,6,4,3,1])