#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n; 
    int x; 
    int y; 
   long   latitude[200000]; 
    long   longitude[200000]; 
      long   height[200000]; 
       long   point1[200000];
    long city[n];
    
    scanf("%d %d %d",&n,&x,&y);
    for(int a0 = 0; a0 < n; a0++){
        long latitude; 
        long longitude; 
        long  height; 
        long  points; 
        scanf("%ld %ld %ld %ld",&latitude,&longitude,&height,&points);
        point1[a0]=points;
        
        // your code goes here
    }
    long sum=0;
    for(int i=0;i<n;i++)
        {
        sum+=point1[i];
    }
    printf("%ld",sum);
    return 0;
}