#include <stdio.h>
#include <vector>
using namespace std;

#define LL unsigned int
#define ff first
#define ss second
#define NRB 15

LL NR1;

int N, M, W, H, jeg;

int nr1[1 << 18];
pair <int, int> hash1[1 << 18][6];

inline int srch(int x, int y, int md1)
{
	int i;

	for (i = 0; i < nr1[md1]; i++)
		if (x - W <= hash1[md1][i].ff && hash1[md1][i].ff <= x && y - H <= hash1[md1][i].ss && hash1[md1][i].ss <= y) return 1;

return 0;
}

inline LL trans(int x, int y) { return x / W + (LL) y / H * jeg; }
inline LL trans1(int x, int y) { return x + (LL) y * jeg; }

int main()
{
	int i, x, y;

	int md1;

	freopen("ograzi.in", "r", stdin);
	freopen("ograzi.out", "w", stdout);
	
	scanf("%d %d %d %d", &N, &M, &W, &H);

	NR1 = (LL) 1231513223 * 151231;

	LL aux;

	jeg = 1000000 / W;

	for (i = 1; i <= N; i++) {
		scanf("%d %d", &x, &y);

		aux = trans(x, y);

		md1 = (aux * NR1) >> NRB;

		hash1[md1][nr1[md1]++] = make_pair(x, y);
	}

	int ww, hh, rez = 0;

	for (i = 1; i <= M; i++) {
		scanf("%d %d", &x, &y);

		ww = x / W; hh = y / H;

		md1 = (trans1(ww, hh) * NR1) >> NRB;
		if (srch(x, y, md1)) { rez++; continue; }

		md1 = (trans1(ww-1, hh) * NR1) >> NRB;
		if (srch(x, y, md1)) { rez++; continue; }

		md1 = (trans1(ww, hh-1) * NR1) >> NRB;
		if (srch(x, y, md1)) { rez++; continue; }

		md1 = (trans1(ww-1, hh-1) * NR1) >> NRB;
		if (srch(x, y, md1)) { rez++; continue; }
	}

	printf("%d\n", rez);

fclose(stdin);
fclose(stdout);
return 0;
}