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#include<iostream>
#include<fstream>
using namespace std;
struct oi
{
long long x,y;
};
struct ograzi
{
long long a,b;
};
int main(){
ifstream f("ograzi.in");
ofstream g("ograzi.out");
long long n,m,w,h,i,j;
ograzi v[100];
oi t[100];
f>>n>>m>>w>>h;
for(i=1;i<=n;i++){
f>>v[i].a>>v[i].b;
}
for(i=1;i<=m;i++){
f>>t[i].x>>t[i].y;
}
long k=0;
for(i=1;i<=n;i++){
for(j=1;j<=n;j++){
if((t[i].x>=v[j].a && t[i].x<=v[j].a+w) && (t[i].y>=v[j].b && t[i].y<=v[j].b+h))k++;
}
}
g<<k;
return 0;
}