#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 sum=0; 
scanf("%d %d %d",&n,&x,&y);
for(int a0 = 0; a0 < n; a0++){
int latitude; 
int longitude; 
int height; 
int points;
        int a=10;
        int b=20;
scanf("%d %d %d %d",&latitude,&longitude,&height,&points);
sum+=points; 
// your code goes here
}
printf("%ld",sum);
return 0;
}