# include <stdio.h>
long long n, m, h, w, i, j, a[50001][2], b[100001][2], nr;

int main()
{
freopen("ograzi.in","r",stdin);
freopen("ograzi.out","w",stdout);
scanf("%ld%ld%ld%ld",&n,&m,&w,&h);
for (i=1;i<=n;i++)
   scanf("%lld%lld",&a[i][0],&a[i][1]);
for (i=1;i<=m;i++)
   scanf("%lld%lld",&b[i][0],&b[i][1]);
nr=0;
for (i=1;i<=m;i++)
   for (j=1;j<=n;j++)
      if (b[i][0]>=a[i][0] && b[i][0]<=a[i][0]+w && b[i][1]>=a[i][1] && b[i][1]<=a[i][1]+h)
	{
	nr++;
	break;
	}
printf("%lld\n",nr);
return 0;
}