#include <iostream>

using namespace std;

int main()
{
    int n,x,y,r,a,b,i,c=0;
    cin>>n>>x>>y>>r;
    for(i=1;i<=n;i++)
    {
        cin>>a>>b;
        if(a<=x+r&&a>=x-r&&b<=y+r&&b>=y-r)
            c++;
    }
    cout<<c;
    return 0;
}