#include <vector>
using std::vector;

class Solution
{
public:
    int maxProfit(vector<int> &prices)
    {
        int profit = 0;
        for (auto i = prices.begin(); i != prices.end(); ++i)
            if (i + 1 != prices.end() && *(i + 1) > *i)
                profit += *(i + 1) - *i;
        return profit;
    }
};