#include <fstream>
#include <unordered_map>
#define x first
#define y second
#define ha 10000000
using namespace std;

ifstream f("ograzi.in");
ofstream g("ograzi.out");

int i,n,t,h,w,x,y,rasp,x1,y1;
unordered_map<long long int,int> m;
pair<int,int> v[50001],a;

void check(int x,int y)
{
    a=v[m[{x/w*ha+y/h}]];
    if (a.x <= x && x <= a.x+w && a.y <= y && y <= a.y+h)
        ++rasp;

    a=v[m[{(-1+x/w)*ha+y/h}]];
    if (a.x <= x && x <= a.x+w && a.y <= y && y <= a.y+h)
        ++rasp;

    a=v[m[{x/w*ha+y/h-1}]];
    if (a.x <= x && x <= a.x+w && a.y <= y && y <= a.y+h)
        ++rasp;

    a=v[m[{(-1+x/w)*ha+y/h-1}]];
    if (a.x <= x && x <= a.x+w && a.y <= y && y <= a.y+h)
        ++rasp;
}

int main()
{
    f>>n>>t>>w>>h;
    for (i=1;i<=n;++i)
    {
        f>>x>>y;
        v[i]={x,y};
        x/=w;
        y/=h;
        m[x*ha+y]=i;
    }
    for(i=1;i<=t;++i)
    {
        f>>x>>y;
        check(x,y);
    }
    g<<rasp;
    return 0;
}