import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        TreeMap<Integer, Integer> counts = new TreeMap<>();
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            int r = sc.nextInt();
            counts.put(x - r, counts.getOrDefault(x - r, 0) + 1);
            counts.put(x + r, counts.getOrDefault(x + r, 0) - 1);
        }
        int current = 0;
        int max = 0;
        for (int x : counts.keySet()) {
            current += counts.get(x);
            max = Math.max(max, current);
        }
        System.out.println(max);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}