#include<stdio.h>
struct oaie
{int x,y;}o[100];
struct ogr
{int x,y;}c[100];
FILE *f=fopen("ograzi.in","r");
FILE *g=fopen("ograzi.out","w");
int n,m,h,w,nr;
void citire()
{int i;
 fscanf(f,"%d %d %d %d",&n,&m,&h,&w);
 for(i=1;i<=n;i++)
  fscanf(f,"%d %d",&c[i].x,&c[i].y);
 for(i=1;i<=m;i++)
  fscanf(f,"%d %d",&o[i].x,&o[i].y);
 fclose(f);
}
void cautare()
{int i,j;
 for(i=1;i<=n;i++)
  for(j=1;j<=m;j++)
   if(o[j].x>=c[i].x && o[j].x<=c[i].x+w && o[j].y>=c[i].y && o[j].y<=c[i].y+h)
    nr++;
}
int main()
{citire();
 cautare();
 fprintf(g,"%d",nr);
 return 1;}