#include <iostream>

using namespace std;


int main(){
  int n, x, y, r, xi, yi;
  long s=0;
  cin>> n>>x>>y>>r;
  for(int i=1; i<=n;i++){
    cin>>xi>>yi;
    if(xi<=(x+(r<0?-r:r)) && xi>=(x-(r<0?-r:r))){
      if(yi<=(y+(r<0?-r:r)) && yi>=(y-(r<0?-r:r))){
        s++;
      }
    }
  }
  cout<< s;

}