#include <fstream>
#include <utility>
#include <vector>
using namespace std;
#define Mod 666013

class InputReader
{
public:
    InputReader() {}
    InputReader(const char* file_name)
    {
        input_file = fopen(file_name,"r");
        cursor = 0;
        fread(buf,SIZE,1,input_file);
    }

    inline InputReader &operator >> (int& n)
    {
        n = 0;
        while (buf[cursor] < '0' || buf[cursor] > '9')
            advance();
        while (buf[cursor] >= '0' && buf[cursor] <= '9')
        {
            n = n * 10 + buf[cursor] - '0';
            advance();
        }
        return *this;
    }

private:
    static const int SIZE = 1<<17;
    char buf[SIZE];
    int cursor = 0;
    FILE* input_file;

    void advance()
    {
        cursor++;
        if (cursor == SIZE)
        {
            cursor = 0;
            fread(buf,SIZE,1,input_file);
        }
    }
};

int N,M,W,H;

int h(int x,int y)
{
    return (x*31 + y) % Mod;
}

vector< pair<int,int> > Hash[Mod];

bool get(int X,int Y,int x,int y)
{
    int i = h(X,Y);
    for (auto j: Hash[i])
        if (x >= j.first && y >= j.second && x <= j.first + W && y <= j.second + H) return 1;
    return 0;
}

int main()
{
    InputReader fin = InputReader("ograzi.in");
    ofstream fout("ograzi.out");

    int x,y,X,Y;

    fin >> N >> M >> W >> H;
    for (int i = 1; i <= N; i++)
    {
        fin >> x >> y;
        X = x/W*W; Y = y/H*H;
        Hash[h(X,Y)].push_back(make_pair(x,y));
    }

    int Sol = 0;
    for (int i = 1; i <= M; i++)
    {
        fin >> x >> y;
        X = x / W * W;
        Y = y / H * H;
        if (get(X,Y,x,y)) Sol++;
        else if (get(X-W,Y,x,y)) Sol++;
        else if (get(X-W,Y-H,x,y)) Sol++;
        else if (get(X,Y-H,x,y)) Sol++;
    }

    fout << Sol << "\n";
}