#include <stdio.h>
#include <ext/hash_map>
#define tx(x) ((2 * (x) + W) / (2 * W))
#define ty(y) ((2 * (y) + H) / (2 * H))
using namespace __gnu_cxx;
int x[50000], y[50000];
int N, M, H, W, xx, yy;
hash_map<int , int> h;

inline bool included(int X, int Y) {
  hash_map<int, int>::iterator it = h.find(hash(X, Y)));
  if (it != h.end()) {
    if (xx >= x[it->second] && xx <= x[it->second] + W &&
        yy >= y[it->second] && yy <= y[it->second] + H)
        return 1;
  }
  return 0;
}

inline int hash(int x, int y) {
  return x + y + (y << 9);
}

int main() {
  FILE* f = fopen ("ograzi.in", "r");
  fscanf(f, "%d %d %d %d", &N, &M, &W, &H);
  for (int i = 0; i < N; i++) {
    fscanf(f, "%d %d", &x[i], &y[i]);
    h[hash(tx(x[i]), ty(y[i]))] = i;
  }
  int num = 0;
  for (int i = 0; i < M; i++) {
    fscanf(f, "%d %d", &xx, &yy);
    int X = tx(xx);
    int Y = ty(yy);
    if (included(X, Y) || included(X - 1, Y) ||
        included(X, Y - 1) || included(X - 1, Y - 1)) num++;
  }
  fclose(f);
  f = fopen("ograzi.out", "w");
  fprintf(f, "%d", num);
  fclose(f);
  return 0;
}