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