#include<stdio.h>
struct {int x,y;}a[50001];
int i,j,n,m,l,h,x,y,nr;
int ver()
{for(i=1;i<=n;i++)
  if(a[i].x<=x&&a[i].x+l>=x&&a[i].y<=y&&a[i].y+h>=y) return 1;
 return 0;}
int main()
{freopen("ograzi.in","r",stdin);
 freopen("ograzi.out","w",stdout);
 scanf("%d %d %d %d",&n,&m,&l,&h);
 for(i=1;i<=n;i++)
  scanf("%d %d",&a[i].x,&a[i].y);
 for(;m;m--)
 {scanf("%d %d",&x,&y);
  nr=nr+ver();}
 printf("%d",nr);
 fclose(stdout);
 return 0;}