#include<stdio.h>
struct nod
{int x,y;
 nod *urm;}*p,*u,*c,*q,*s;
FILE *f=fopen("ograzi.in","r");
FILE *g=fopen("ograzi.out","w");
int n,m,h,w,nr;
void citire()
{int i,a,b;
 fscanf(f,"%d %d %d %d",&n,&m,&h,&w);
 fscanf(f,"%d %d",&a,&b);
 c=new nod; c->x=a;c->y=b;
 c->urm=0;p=u=c;
 for(i=2;i<=n;i++)
  {fscanf(f,"%d %d",&a,&b);
   c= new nod;c->x=a;c->y=b;
   c->urm=NULL; u->urm=c;
   u=c;}
 fscanf(f,"%d %d",&a,&b);
 c=new nod; c->x=a;c->y=b;c->urm=0;
 q=s=c;
 for(i=2;i<=m;i++)
  {fscanf(f,"%d %d",&a,&b);
   c=new nod; c->x=a;c->y=b;
   c->urm=0;s->urm=c;s=c;}
 fclose(f);
}
void cautare()
{int i,j; nod *k;
  c=p;k=q;
   while(c)
    {while (k)
	 {if(k->x>=c->x && k->x<=c->x+w && k->y>=c->y && k->y<=c->y+h)
	   nr++;
	 k=k->urm;}
	c=c->urm;}
}
int main()
{citire();
 cautare();
 fprintf(g,"%d",nr);
 return 0;
 }