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#define _CRT_SECURE_NO_WARNINGS
#include <fstream>
#include <iostream>
#include <unordered_map>
#include <vector>
#include <string>
#include <stdio.h>
#include <ctype.h>
using namespace std;
class InParser {
private:
FILE *fin;
char *buff;
int sp;
char read_ch() {
++sp;
if (sp == 4096) {
sp = 0;
fread(buff, 1, 4096, fin);
}
return buff[sp];
}
public:
InParser(const char* nume) {
fin = fopen(nume, "r");
buff = new char[4096]();
sp = 4095;
}
InParser& operator >> (int &n) {
char c;
while (!isdigit(c = read_ch()) && c != '-');
int sgn = 1;
if (c == '-') {
n = 0;
sgn = -1;
} else {
n = c - '0';
}
while (isdigit(c = read_ch())) {
n = 10 * n + c - '0';
}
n *= sgn;
return *this;
}
InParser& operator >> (long long &n) {
char c;
n = 0;
while (!isdigit(c = read_ch()) && c != '-');
long long sgn = 1;
if (c == '-') {
n = 0;
sgn = -1;
} else {
n = c - '0';
}
while (isdigit(c = read_ch())) {
n = 10 * n + c - '0';
}
n *= sgn;
return *this;
}
};
struct elem{
int x, y;
};
struct fast_elem{
int poz1, poz2, x;
};
struct fast_map{
const int MOD = 983875;
vector <fast_elem> v[983875];
void add_elem(int poz1, int poz2, int x){
int a;
poz1++;
poz2++;
a = ( 1ll * ( poz1 + poz2 ) * ( poz1 + poz2 + 1 ) / 2 + poz2 ) % MOD;
v[a].push_back( { poz1, poz2, x } );
}
int get_elem(int poz1, int poz2){
int x, i;
//return -1;
poz1++;
poz2++;
x = ( 1ll * ( poz1 + poz2 ) * ( poz1 + poz2 + 1 ) / 2 + poz2 ) % MOD;
//cout << poz1 << ' ' << poz2 << ' ' << x << '\n';
i = 0;
while( i < v[x].size() && ( v[x][i].poz1 != poz1 || v[x][i].poz2 != poz2 ) ){
i++;
}
//cout << i << '\n';
if( i < v[x].size() ){
return v[x][i].x;
}
return -1;
}
};
vector <elem> v;
fast_map f;
int w, h;
static inline int check(int x, int y, int poz){
if( poz == -1 ){
return 0;
}
//cout << x << ' ' << y << ' ' << v[poz].x << ' ' << v[poz].y << '\n';
if( v[poz].x <= x && v[poz].y <= y && v[poz].x + w >= x && v[poz].y + h >= y ){
return 1;
}
return 0;
}
int main(){
int n, m, i, x, y, r, ad;
//elem a;
InParser fin( "ograzi.in" );
ofstream fout( "ograzi.out" );
fin >> n >> m >> w >> h;
//fin.get();
for( i = 0; i < n; i++ ){
//a = read();
fin >> x >> y;
/*x = a.x;
y = a.y;*/
//cout << x << ' ' << y << '\n';
v.push_back( { x, y } );
f.add_elem( x / w, y / h, i );
}
r = 0;
for( i = 0; i < m; i++ ){
//a = read();
fin >> x >> y;
/*x = a.x;
y = a.y;*/
//cout << x << ' ' << y << '\n';
ad = max( check( x, y, f.get_elem( x / w, y / h ) ), check( x, y, f.get_elem( x / w - 1, y / h ) ) );
ad = max( check( x, y, f.get_elem( x / w, y / h - 1 ) ), ad );
ad = max( check( x, y, f.get_elem( x / w - 1, y / h - 1 ) ), ad );
r += ad;
}
fout << r;
return 0;
}