#include <bits/stdc++.h>

using namespace std;
map<pair<int,int>,pair<int,int>> mp;
int n,m,w,h,nr;
const int Mod = 666013;
vector <pair<int,int>> H[Mod+5];
const int bsize = (1<<16)+1;
char buffer[bsize];
int p;
int ReadInt()
{
    int nr=0;
    while(!isdigit(buffer[p]))
    {
        if(p==bsize-1)
        {
            p=0;
            fread(buffer,1,bsize,stdin);
        }
        else
            p++;
    }
    while(isdigit(buffer[p]))
    {
        nr=nr*10+buffer[p]-'0';
        if(p==bsize-1)
        {
            p=0;
            fread(buffer,1,bsize,stdin);
        }
        else
            p++;
    }
    return nr;
}
void verif(int Key, pair<int,int> b)
{
    for(auto a : H[Key])
    {
        if(a.first<=b.first && a.first+w>=b.first && a.second<=b.second && a.second+h>=b.second)
        {
            ++nr;
        }
    }
}
int main()
{
    freopen("ograzi.in","r",stdin);
    freopen("ograzi.out","w",stdout);
    n=ReadInt();
    m=ReadInt();
    w=ReadInt();
    h=ReadInt();
    for(int i=1; i<=n; i++)
    {
        int x,y;
        x=ReadInt();
        y=ReadInt();
        int X=x,Y=y;
        x=(x+w-1)/w;
        y=(y+h-1)/h;
        H[(x*100+y)%Mod].push_back({X,Y});
    }
    for(int i=1; i<=m; i++)
    {
        int x,y;
        x=ReadInt();
        y=ReadInt();
        int X=x,Y=y;
        x=(x+w-1)/w;
        y=(y+h-1)/h;
        pair<int,int> k= {X,Y};
        verif((x*100+y)%Mod,k);
        verif(((x-1)*100+y)%Mod,k);
        verif((x*100+y-1)%Mod,k);
        verif(((x-1)*100+y-1)%Mod,k);
    }
    cout<<nr<<'\n';
    return 0;
}