#include <iostream>
#include <math.h>
using namespace std;
int main(){
long long int N = 0, x = 0, y = 0, R = 0, xi = 0, yi = 0, formulaGenerala = 0, coordonata = 0;
cin >> N >> x >> y >> R;
for(long int i = 1;i<=N;i++){
    cin >> xi >> yi;
    formulaGenerala = sqrt(((xi - x) * (xi - x)) + ((yi - y) * (yi - y)));
    if(formulaGenerala <= sqrt(R*R) || formulaGenerala == sqrt(R*R)){
        coordonata++;
    }
}


cout << coordonata;


}