#include <fstream>
#include <cstring>
#include <string>
#include <vector>
#include <algorithm>
#include <bitset>
#include <iomanip>
using namespace std;
#define x first
#define y second
#define mod 666013
#define punct pair<int,int>

ifstream fin("ograzi.in");
ofstream fout("ograzi.out");
vector<punct> has[1456779];
int i,j,n,m,k,l,x,w,h,a,b,total;
int dx[4]={-1,-1,0,0},dy[4]={-1,0,-1,0};
bool apartine();
punct hhh(punct a)
{
    int i;
    a.x /= w;
    a.y /= h;
    return a;
}
bool apartine(punct a, punct b)
{
    if(a.x < b.x)
        return 0;
    if(a.x > b.x + w)
        return 0;
    if(a.y < b.y)
        return 0;
    if(a.y > b.y + h)
        return 0;
    return 1;
}
int main()
{
    fin >> n >> m >> w >> h;
    for(i = 1; i <= n; i++)
    {
        fin >> a >> b;
        has[ abs((a/w*43 + b/h ) % mod)  ].push_back({a,b});
    }
    for(i = 1; i <= m; i++)
    {
        punct oaie;
        fin >> oaie.x >> oaie.y;
        punct c = hhh(oaie);
        int ok = 0;
        for(int k = 0 ;k < 4; k++)
        {
            a = abs((c.x*43 + dx[k]*43 + c.y + dy[k] ) % mod);
            for(j = 0; j < has[a].size() ; j++)
            {
                if(apartine(oaie, has[a][j]))
                    ok = 1;
            }
        }
        total += ok;
    }

    fout<<total;

    return 0;
}