class Solution {
public:
    int fillCups(vector<int>& amount) {
        int sum = 0;
        sort(amount.begin(),amount.end());
        if(amount[0] + amount[1] <= amount[2])
        return amount[2];
        else
        {
            int tmp = amount[0]+amount[1]-amount[2];
            sum = (tmp+1)/2+amount[2];
        }
        return sum;
    }
};