#include <stdio.h>
#include <string.h>
long n,m,w,h;
long nroi;
struct coord{long x;long y;} ogr[50002],aux;
       


long poz(long p,long u)
{ long x,st,dr; x=ogr[p].x; st=p; dr=u;
  while(st<dr)
   { while(st<dr && x<=ogr[dr].x) dr--; ogr[dr]=ogr[st];
     while(st<dr && x>=ogr[st].y) st++; ogr[st]=ogr[dr];
   } ogr[st].x=x; return st;

}
void Quick_sort(long p,long u)
{ long m;
  if(p<u) { m=poz(p,u);
        Quick_sort(p,m-1);
	    Quick_sort(m+1,u);
	  }
}



void bubbles(){
int b,i;
do{b=0;
   for(i=1;i<n;i++)
    if(ogr[i].x==ogr[i+1].x)
       if(ogr[i].y>ogr[i+1].y) 
                       {aux=ogr[i];
                        ogr[i]=ogr[i+1];
                        ogr[i]=aux;
                       b=1;}
                       
       }while(b);
}
//INTERSCHIMBARE();
/*void interschimbare(){
     long i,j;
		 for(i=1;i<=n;i++){
				for(j=i+1;j<=n;j++){
				 if(ogr[i][0]>ogr[j][0]){aux=ogr[i][0];
			                     ogr[i][0]=ogr[j][0];
			                     ogr[j][0]=aux; 
                                 aux=ogr[i][1];
			                     ogr[i][1]=ogr[j][1];
			                     ogr[j][1]=aux; 
                                 }
         if(ogr[i][0]==ogr[j][0]&&ogr[i][1]>ogr[j][1]){aux=ogr[i][0];
                                        			  ogr[i][0]=ogr[j][0];
			                                          ogr[j][0]=aux; 
                                                      aux=ogr[i][1];
			                                          ogr[i][1]=ogr[j][1];
			                                          ogr[j][1]=aux; }
                   }
         }
                                             
     }*/

int cautare(long x,long y){
long st,dr,c;
st=1;
dr=n;
while(dr>=st){
c=(dr+st)/2;

if(x>=ogr[dr].x&&x<=ogr[dr].x+w) 
    if(y>=ogr[dr].y&&y<=ogr[dr].y+h){ return 1;}

if(x>=ogr[st].x&&x<=ogr[st].x+w)
		if(y>=ogr[st].y&&y<=ogr[st].y+h){ return 1;}


if(x<ogr[c].x){ dr=c-1;continue;}
if(x>ogr[c].x+w){ st=c+1;continue;}
if(x>=ogr[c].x&&x<=ogr[c].x+w){
		if(y<ogr[c].y){ dr=c-1;continue;}
		if(y>ogr[c].y+h){ st=c+1;continue;}
		if(y>=ogr[c].y&&y<=ogr[c].y+h){ return 1;}
if(dr==st) return 0;
    }
}
return 0;
}

    

void citire(){
     FILE *in;
     long i,x,y;
     char aux[1000];
     
     in=fopen("ograzi.in","r");
//      fgets(aux,1000,in);
      fscanf(in,"%ld %ld %ld %ld",&n,&m,&w,&h);

			for(i=1;i<=n;i++){
                 fgets(aux,1000,in);              
				 fscanf(in,"%ld %ld",&ogr[i].x,&ogr[i].y);
	  										 }
      Quick_sort(1,n);
      bubbles();

//interschimbare();
			for(i=1;i<=m;i++){
                       fscanf(in,"%ld %ld",&x,&y);
                       nroi=nroi+cautare(x,y);
//                         procesare(x,y);
                       }
     
     }

void scriere(){
     FILE *out;
     out=fopen("ograzi.out","w");
     fprintf(out,"%ld",nroi);     
     }
     
int main(){
     citire();
     scriere();
return 0;
     }