import java.util.Scanner;

public class prog{
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn = new Scanner(System.in);
		int N = scn.nextInt();
		int x = scn.nextInt();
		int y = scn.nextInt();
		int r = scn.nextInt();
		int val1 = x - r;
		int val2 = x + r;
		int val11 = y - r;
		int val22 = y + r;
		int ans = 0;
		while (N-- > 0) {
			int a = scn.nextInt();
			int b = scn.nextInt();
			if (a >= val1 && a <= val2 && b >= val11 && b <= val22) {
				ans++;
			}
		}
		System.out.println(ans);
	}
}