#include <iostream>
#include<fstream>
#include<vector>
#define x(i)(j) ve(i)(j).x
using namespace std;
const int mod=171;
const int nmax=200005;
struct ograda
{
    int l,c,loc;
}aux;
struct punct
{
    int x,y;
}ve[nmax][4];
string str;
vector<ograda> v[mod+5][mod+5];
int key,i,j,n,m,xt,yt,xf,yf,ret,w,h,tot,c,num,cadran,lin,col,xi,yi,wh,locatii[nmax],myloc,locatiile,key1;
inline void ins()
{
    key=lin%mod;
    key1=col%mod;
    for(int idx=0;idx<v[key][key1].size();idx++)
    {
        if(v[key][key1][idx].l==lin&&v[key][key1][idx].c==col)
        {
            myloc=v[key][key1][idx].loc;
            ve[myloc][cadran].x=xi;
            ve[myloc][cadran].y=yi;
            return;
        }
    }
    locatiile++;
    aux.l=lin,aux.c=col,aux.loc=locatiile;
    ve[locatiile][cadran].x=xi;
    ve[locatiile][cadran].y=yi;
    v[key][key1].push_back(aux);
}
inline void finds()
{
    key=xf%mod;
    key1=yf%mod;
    ret=0;
    for(int idx=0;idx<v[key][key1].size();idx++)
    {
        if(v[key][key1][idx].l==xf&&v[key][key1][idx].c==yf)
        {
            myloc=v[key][key1][idx].loc;
            if(ve[myloc][0].x>=xt&&ve[myloc][0].y>=yt) ret=1;
            if(ve[myloc][1].x!=0&&ve[myloc][1].x<=xt&&ve[myloc][1].y>=yt) ret=1;
            if(ve[myloc][2].x!=0&&ve[myloc][2].x<=xt&&ve[myloc][2].y<=yt) ret=1;
            if(ve[myloc][3].y!=0&&ve[myloc][3].x>=xt&&ve[myloc][3].y<=yt) ret=1;
            return;
        }
    }
    return;
}
int getnum()
{
    num=0;
    while(str[c]>='0'&&str[c]<='9')
    {num=num*10+str[c]-'0';c++;}
    c++;
    return num;
}
int main()
{
    ifstream f("ograzi.in");
    ofstream g("ograzi.out");
    getline(f,str);
    c=0;
    n=getnum();m=getnum();w=getnum();h=getnum();
    for(i=1;i<=n;i++)
    {
        getline(f,str);
        c=0;
        xt=getnum();yt=getnum();
        xt++;yt++;
        xf=xt/w;yf=yt/h;
        cadran=2,lin=xf,col=yf,xi=xt,yi=yt;
        ins();
        cadran=3,lin=xf+1,col=yf,xi=xt+w,yi=yt;
        ins();
        cadran=0,lin=xf+1,col=yf+1,xi=xt+w,yi=yt+h;
        ins();
        cadran=1,lin=xf,col=yf+1,xi=xt,yi=yt+h;
        ins();
    }
    for(i=1;i<=m;i++)
    {
        getline(f,str);
        c=0;
        xt=getnum();yt=getnum();
        xt++;yt++;
        xf=xt/w;yf=yt/h;
        finds();
        tot+=ret;
    }
    g<<tot;
    return 0;
}