#include <bits/stdc++.h>
using namespace std;

struct ct {
  int a, b, c, d;
} ct;

bool comp(struct ct x, struct ct y){
  return x.c < y.c;
}
 
int main() {
 
  int n, x, y;
  scanf("%d%d%d", &n, &x, &y);
 
  struct ct foo[n];
  for (int i = 0; i < n; i++) {
    int a, b, c, d;
    scanf("%d%d%d%d", &a, &b, &c, &d);
    foo[i].a = a;
    foo[i].b = b;
    foo[i].c = c;
    foo[i].d = d;
  }

  sort(foo, foo+n, comp);

  int ans = 0;
  for (int i = 0; i < n; i++) {
    ans += foo[i].d;
  }

  printf("%d", ans);
 
  return 0;
}