#include <fstream>
#include <vector>

using namespace std;

ifstream fin("ograzi.in");
ofstream fout("ograzi.out");

const int mod= 666013;

int n, m, w, h;

struct str {
    int x, y;
};

vector <str> v[mod];

inline str mp( int x, int y ) {
    str sol;
    sol.x= x, sol.y= y;
    return sol;
}

inline bool check( int k, int x, int y ) {
    if ( k>=0 ) {
        for ( vector <str>::iterator it= v[k].begin(); it!=v[k].end(); ++it ) {
            if ( (*it).x<=x && (*it).x+w>=x && (*it).y<=y && (*it).y+h>=y ) {
                return 1;
            }
        }
    }
    return 0;
}

int main(  ) {
    fin>>n>>m>>w>>h;
    for ( int i= 1, x, y; i<=n; ++i ) {
        fin>>x>>y;
        v[((x/w)*1001+y/h)%mod].push_back(mp(x, y));
    }

    int sol= 0;
    for ( int i= 1, x, y; i<=m; ++i ) {
        fin>>x>>y;
        int k1= ((x/w-1)*1001+y/h-1)%mod, k2= ((x/w-1)*1001+y/h)%mod, k3= ((x/w)*1001+y/h-1)%mod, k4= ((x/w)*1001+y/h)%mod;

        if ( check(k1, x, y) || check(k2, x, y) || check(k3, x, y) || check(k4, x, y) ) {
            ++sol;
        }
    }

    fout<<sol<<"\n";

    return 0;
}