def maxProfit(prices):
    """
    :type prices: List[int]
    :rtype: int
    """
    lowest = min(prices)
    if lowest == prices[len(prices)-1]:
        print('no profit')
        return 0
    for i in range(len(prices)):
        if lowest == prices[i]:
            k = i+1
            # print(f'k is {k}')
            profit = max(prices[k:]) - lowest
            print(profit)
            return profit

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