#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
using namespace std;
FILE *f=fopen("ograzi.in","r"),*g=fopen("ograzi.out","w");
const int maxx=100005;
int difx[5]={0,0,-1,-1},dify[5]={0,-1,0,-1},x,y,a1,a2,key,i,n,m,w,h,l,j,nr,lung;
vector < pair<int , int> > hash[maxx+5];
char s[20];
int line(int x,int y,int l)
{
    a1=(x+w-1)/w;
    a2=(y+h-1)/h;
    if(a1-difx[l]>=0&&a2+dify[l]>=0)
        return ((a1+difx[l])*100+(a2+dify[l]))%maxx;
    return 100006;
}
bool apar(pair<int , int > a,pair<int , int > b)
{
    if(b.first<=a.first+w&&b.first>=a.first&&b.second<=a.second+h&&b.second>=a.second)
        return true;
    return false;
}
void parse_read(int &x,int &y)
{
    int i;
    fgets(s,15,f);
    lung=strlen(s)-1;
    for(x=y=0 , nr=1 , i=0;i<lung;i++)
    {
        if(s[i]>='0'&&s[i]<='9')
        {
            if(nr==1)
            {
                while(s[i]>='0'&&s[i]<='9'&&i<lung)
                {
                    x=x*10+s[i]-'0';
                    i++;
                }
                nr=2;
            }
            else
            {
                while(s[i]>='0'&&s[i]<='9'&&i<lung)
                {
                    y=y*10+s[i]-'0';
                    i++;
                }
                i=lung;
            }
        }
    }
}
void read()
{
    fscanf(f,"%d%d%d%d",&n,&m,&w,&h);
    fgets(s,3,f);
    for(i=1;i<=n;i++)
    {
        parse_read(x,y);
        key=line(x,y,0);
        hash[key].push_back(make_pair(x,y));
    }
    for(i=1;i<=m;i++)
    {
        parse_read(x,y);
        for(l=0;l<=3;l++)
        {
            key=line(x,y,l);
            for(j=0;j<hash[key].size();j++)
                if(apar(hash[key][j],make_pair(x,y)))
                {
                    nr++;
                    l=5;
                    break;
                }
        }
    }
}
int main()
{
    read();
    fprintf(g,"%d\n",nr);
    return 0;
}