#include <cstdio>

#define file_in "ograzi.in"
#define file_out "ograzi.out"

int n,nr,i,j,ok,x[50100],y[50100],xx,yy,w,h,m;

int main()
{
	freopen(file_in,"r",stdin);
	freopen(file_out,"w",stdout);
	
	scanf("%d %d %d %d", &n,&m,&w,&h);
	for (i=1;i<=n;++i)
		 scanf("%d %d", &x[i],&y[i]);
	
	nr=0;
	for (i=1;i<=m;++i)
	{
		ok=0;
		scanf("%d %d", &xx,&yy);
		for (j=1;j<=n;++j)
		{
			if (((xx>=x[j] && xx<=x[j]+w))
				&&
			 ((yy>=y[j] && yy<=y[j]+h)))		
				nr++,ok=1;
		}
	}
	
	printf("%d", nr);
	
	fclose(stdin);
	fclose(stdout);
	
	return 0;
}