#include <stdio.h>

#define input "ograzi.in"
#define output "ograzi.out"
#define dimmax 50001

struct ograzi
{
    long x,y;
}a[dimmax];

long n,m,w,h,rezultat;

int main()
{
        freopen(input,"r",stdin);
        freopen(output,"w",stdout);
        long i,j,x,y;
        scanf("%ld%ld%ld%ld",&n,&m,&w,&h);
        for(i=1;i<=n;++i)
          scanf("%ld%ld",&a[i].x,&a[i].y);
          
        for(j=1;j<=m;++j)
        {
          scanf("%ld%ld",&x,&y);
          for(i=1;i<=n;++i)
            if(x>=a[i].x && y>=a[i].y)
              if(x-a[i].x<=w && y-a[i].y<=h)
              {
                ++rezultat;
                break;
              } 
        }       
        
        printf("%ld",rezultat);
        
        return 0;
}