#include<fstream>
#include<map>
#include<vector>
using namespace std;
ifstream f("ograzi.in");
ofstream g("ograzi.out");

struct elem
{
    int x,y;
    bool operator < (const elem &a) const
    {
        if(a.x==x)
            return a.y<y;
        return a.x<x;
    }
};
map<elem,vector<elem>>p;
int main()
{
    int n,m,a,b,x,y,ox,oy,sol=0,j,l,ok,xx,yy,i;
    f>>n>>m>>b>>a;
    for(i=1;i<=n;i++)
    {
        f>>ox>>oy;
        x=ox/a;
        y=oy/b;
        if(ox%a!=0)
        {
            if(oy%b!=0)
            {
                p[{x,y}].push_back({ox,oy});
                p[{x+1,y}].push_back({ox,oy});
                p[{x,y+1}].push_back({ox,oy});
                p[{x+1,y+1}].push_back({ox,oy});
            }
            else
            {
                p[{x,y}].push_back({ox,oy});
                p[{x+1,y}].push_back({ox,oy});
                p[{x,y+1}].push_back({ox,oy});
                p[{x+1,y+1}].push_back({ox,oy});
                p[{x,y-1}].push_back({ox,oy});
                p[{x+1,y-1}].push_back({ox,oy});
            }
        }
        else
        {
            if(oy%b!=0)
            {
                p[{x,y}].push_back({ox,oy});
                p[{x+1,y}].push_back({ox,oy});
                p[{x,y+1}].push_back({ox,oy});
                p[{x+1,y+1}].push_back({ox,oy});
                p[{x-1,y}].push_back({ox,oy});
                p[{x-1,y+1}].push_back({ox,oy});
            }
            else
            {
                p[{x,y}].push_back({ox,oy});
                p[{x+1,y}].push_back({ox,oy});
                p[{x,y+1}].push_back({ox,oy});
                p[{x+1,y+1}].push_back({ox,oy});
                p[{x,y-1}].push_back({ox,oy});
                p[{x+1,y-1}].push_back({ox,oy});
                p[{x-1,y+1}].push_back({ox,oy});
                p[{x-1,y}].push_back({ox,oy});
                p[{x-1,y-1}].push_back({ox,oy});
            }
        }
    }
    for(i=1;i<=n;i++)
    {
        f>>ox>>oy;
        x=ox/a;
        y=oy/a;
        ok=0;
        if(ox%a!=0)
        {
            if(oy%b!=0)
            {
                l=p[{x,y}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
            }
            else
            {
                l=p[{x,y}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
                l=p[{x,y-1}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
            }
        }
        else
        {
            if(oy%b!=0)
            {
                l=p[{x,y}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
                l=p[{x-1,y}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
            }
            else
            {
                l=p[{x,y}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
                l=p[{x,y-1}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
                l=p[{x-1,y}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
                l=p[{x-1,y-1}].size();
                for(j=0;j<l&&ok==0;j++)
                {
                    xx=p[{x,y}][j].x;
                    yy=p[{x,y}][j].y;
                    if(ox>=xx&&ox<=xx+a&&oy>=yy&&oy<=yy+b)
                        sol++,ok=1;
                }
            }
        }
    }
    g<<sol;
    return 0;
}