#include<fstream>
#include<map>
#include<vector>
using namespace std;
ofstream g("ograzi.out");
class InputReader {
private:
static const int BUFF_SIZE = 100000;
FILE *f;
int bp;
char buff[BUFF_SIZE];
inline void nxt() {
if (++bp == BUFF_SIZE) {
fread(buff, sizeof(char), BUFF_SIZE, f);
bp = 0;
}
}
public:
InputReader (const char *file_name) {
f = fopen(file_name, "r");
bp = BUFF_SIZE - 1;
}
void close() {
fclose(f);
}
InputReader& operator >> (int &num) {
num = 0;
while (isdigit(buff[bp]) == 0&&buff[bp]!='-')
nxt();
int semn=1;
if(buff[bp]=='-')
{
semn=-1;
nxt();
}
while (isdigit(buff[bp])) {
num = num * 10 + (buff[bp] - '0')*semn;
nxt();
}
return *this;
}
} f("ograzi.in");
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<=m;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;
}