#include <bits/stdc++.h>

using namespace std;

inline double getDist(const double &a, const double &b, const double &x, const double &y) {
    return sqrt((a - x) * (a - x) + (b - y) * (b - y));
}

int main() {
    ios::sync_with_stdio(false);

    double n, x, y, r;
    cin >> n >> x >> y >> r;

    int ans = 0;
    for(int i = 1; i <= n; i++) {
        double a, b;
        cin >> a >> b;

        if(getDist(a, b, x, y) <= r) {
            ans++;
        }
    }

    cout << ans;

    cout << "\n";
    return 0;
}