#include <bits/stdc++.h>
#define maxn 100005
#define dmax 193939

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

int X[maxn], Y[maxn];
std::vector <int> v[dmax];

int sol = 0, lx, ly, x, y;

void check (int a, int b){
    int  p = (97*a+b)%dmax;
    if (v[p].empty() == false){
        for (auto i:v[p]){
            if (X[i] <= x and x <= X[i]+lx and Y[i] <= y and y <= Y[i]+ly)
                sol ++;
        }
    }
}

int main()
{
    int A, S, i, p, a, b;
    fin >> A >> S >> lx >> ly;
    for (i=0; i<A; i++){
        fin >> X[i] >> Y[i];
        a = (X[i] + lx - 1) / lx;
        b = (Y[i] + ly - 1) / ly;
        v[(97*a+b)%dmax].push_back (i);
    }

    for (i=0; i<S; i++){
        fin >> x >> y;
        a = (x + lx - 1) / lx;
        b = (y + ly - 1) / ly;
        check (a, b);
        check (a-1, b);
        check (a, b-1);
        check (a-1, b-1);
    }

    fout << sol << '\n';
    return 0;
}