#include <stdio.h>
#define dim 50001

struct dr
{   long x,y;
}a[dim];

long x,y,n,m,w,h,i,j,s;

int main ()
{   freopen ("ograzi.in","r",stdin);
	freopen ("ograzi.out","w",stdout);
	scanf("%ld%ld%ld%ld",&n,&m,&w,&h);
	for(i=0;i<n;++i)
	{	scanf("%ld%ld",&x,&y);
		a[i].x=x;
		a[i].y=y;
	}
	for(i=0;i<m;++i)
	{   scanf("%ld%ld",&x,&y);
		for(j=0;j<n;++j)
		{   if(x>=a[j].x&&y>=a[j].y)
				if(x<=(a[j].x+w)&&y<=(a[j].y+h))
				{   ++s;
					break;
				}
		}
	}
	printf("%ld",s);
	return 0;
}