#include <iostream>
#include <math.h>
using namespace std;
int main(){
int N = 0, x = 0, y = 0, R = 0, d = 0, xi = 0, yi = 0, c = 0, i = 0;
cin >> N >> x >> y >> R;
while(N!=i){
cin >> xi >> yi;
d = sqrt(((xi - x) * (xi - x)) + ((yi - y) * (yi - y)));
if(d*d < R * R || d*d==R*R && !(d*d) > R*R){
    c++;
}
i++;
}

cout << c << endl;

}