#include <fstream.h>
fstream f("ograzi.in",ios::in),g("ograzi.out",ios::out);
int nr,v[5000],b[5000],k[5000],t[5000];
long n,m,w,h,i,j;
void main()
{
f>>n>>m>>w>>h;
for (i=1;i<=n;i++)
	{
	f>>v[i];
	f>>t[i];
	}
for (i=1;i<=m;i++)
	{
	f>>k[i];
	f>>b[i];
	}
nr=0;
for (i=1;i<=m;i++)
	for (j=1;j<=n;j++)
		if ((k[i]>=v[i]) && (k[i]<=v[i]+w) && (b[i]>=t[i]) && (b[i]<=t[i]+h))
			{
			nr++;
			break;
			}
g<<nr;
f.close();
g.close();
}