#include<fstream>
#include<vector>
#define MOD 123331
using namespace std;
ifstream f("ograzi.in");
ofstream g("ograzi.out");
int sol,x00,y00,x11,y11,n,m,h,w,i,j,x,y,k,ok;
vector<pair<int,int> >has[MOD];
inline int key(int x,int y)
{
    if(x<0||y<0)
    return -1;
    return (1LL*x*980123+y)%MOD;
}
int main()
{
    f>>n>>m>>w>>h;
    for(i=1;i<=n;++i)
    {
        f>>x>>y;
        has[key(x/w,y/h)].push_back(make_pair(x,y));
    }
    for(i=1;i<=m;++i)
    {
        f>>x>>y;
        ok=1;
        for(x00=-1;x00<=0&&ok;++x00)
        for(y00=-1;y00<=0&&ok;++y00)
        {
            k=key(x/w+x00,y/h+y00);
            if(k==-1)
            continue;
            for(j=0;j<has[k].size()&&ok;++j)
            {
                x11=has[k][j].first;
                y11=has[k][j].second;
                if(x>=x11&&x<=x11+w&&y>=y11&&y<=y11+h)
                {
                    ++sol;
                    ok=0;
                }
            }
        }
    }
    g<<sol<<'\n';
    return 0;
}