using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        string[] tokens_n = Console.ReadLine().Split(' ');
        int n = Convert.ToInt32(tokens_n[0]);
        int x = Convert.ToInt32(tokens_n[1]);
        int y = Convert.ToInt32(tokens_n[2]);
        int s=0;
        for(int a0 = 0; a0 < n; a0++){
            string[] tokens_latitude = Console.ReadLine().Split(' ');
            int latitude = Convert.ToInt32(tokens_latitude[0]);
            int longitude = Convert.ToInt32(tokens_latitude[1]);
            int height = Convert.ToInt32(tokens_latitude[2]);
            int points = Convert.ToInt32(tokens_latitude[3]);
            // your code goes here
             s=s+points;
        }
        Console.WriteLine("{0}",s);
       
    }
}