#include<iostream>
using namespace std;
class list
    {
private:
    int longitude,latitude,height,points;
    list *next;
    public:
    list()
        {
        next = NULL;
    }
    void create()
        {
      list *start = this;
        list *node = new list();
        int lo,la,h,p;
        cin >> la >> lo >> h >> p;
        node->latitude = la;
        node->longitude = lo;
        node->height = h;
        node->points = p;
        int flag = 0;
        while(start->next != NULL)
            {
            if(node->height <= start->next->height)
                {
                list *temp = start->next;
                start->next = node;
                node->next = temp;
                flag = 1;
                break;
                
            }
            start = start->next;
        }
        if(flag == 0)
            {
            start->next = node;
        }
    }
    void display()
        {
        list *start = this->next;
        while(start != NULL)
            {
            cout << start->latitude << " " << start->longitude << " " << start->height << " " << start->points;
            cout << endl;
            start = start->next;
        }
    }
void count()
    {
    int count = 0;
    list *start = this->next;
    while(start != NULL)
       {
        count = count + start->points;
        start = start->next;
    } 
       cout << count;
}



};
int main()
    {
    int n,x,y;
    list l;
    cin >> n >> x >> y;
    for(int i=0;i<n;i++)
        {
        l.create();
    }
    l.count();
    
    
}