#include <iostream>

using namespace std;

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