import java.util.*;

public class Main {
    static final int BASE = 100000;
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] imos = new int[BASE * 4 + 1];
		for (int i = 0; i < n; i++) {
		    int x = sc.nextInt();
		    int r = sc.nextInt();
		    imos[x + BASE * 2 - r]++;
		    imos[x + BASE * 2 + r]--;
		}
		int max = imos[0];
		for (int i = 1; i < imos.length; i++) {
		    imos[i] += imos[i - 1];
		    max = Math.max(max, imos[i]);
		}
		System.out.println(max);
	}
}