#include <bits/stdc++.h>
#define MOD 666013
using namespace std;
int dx[]={0,-1,0,-1};
int dy[]={0,0,-1,-1};
int h,w,n,i,j,m,x,y,sol;
vector<pair<int,int> >Hash[MOD];
class InputReader
{
public:
    InputReader() {}
    InputReader(const char *file_name)
    {
        input_file=fopen(file_name,"r");
        cursor=0,
        fread(buffer,SIZE,1,input_file);
    }
    inline InputReader &operator >>(int &n)
    {
        while(buffer[cursor]<'0' || buffer[cursor]>'9')
            advance();
        n=0;
        while('0'<=buffer[cursor] && buffer[cursor]<='9')
            n=n*10+buffer[cursor]-'0',
            advance();
        return *this;
    }
private:
    FILE *input_file;
    static const int SIZE = 1<<17;
    int cursor;
    char buffer[SIZE];
    inline void advance()
    {
        ++ cursor;
        if(cursor==SIZE)
        {
            cursor=0;
            fread(buffer,SIZE,1,input_file);
        }
    }
};
bool hash_find(pair<int,int> x)
{
    for(int i=0;i<4;i++)
    {
        int key=((x.first/w+dx[i])*1000+x.second/h+dy[i])%MOD;
        if(key<0)
            continue;
        for(vector<pair<int,int> >::iterator it=Hash[key].begin();it!=Hash[key].end();it++)
            if (it->first<=x.first && x.first<=it->first+w && it->second<=x.second && x.second<=it->second+h)
                return true;
    }
    return false;
}
int main()
{
    InputReader f("ograzi.in");
    freopen("ograzi.out","w",stdout);
    f>>n>>m>>w>>h;
    for(i=1;i<=n;i++)
        f>>x>>y,
        Hash[((x/w)*1000+y/h)%MOD].push_back(make_pair(x,y));
    for(i=1;i<=m;i++)
        f>>x>>y,
        sol+=hash_find(make_pair(x,y));
    printf("%d",sol);
    return 0;
}