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();
        int[] lefts = new int[n];
        int[] rights = new int[n];
        TreeMap<Integer, Integer> compress = new TreeMap<>();
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            int r = sc.nextInt();
            lefts[i] = x - r;
            compress.put(lefts[i], null);
            rights[i] = x + r;
            compress.put(rights[i], null);
        }
        int idx = 1;
        for (int x : compress.keySet()) {
            compress.put(x, idx++);
        }
        int[] imos = new int[idx];
        for (int i = 0; i < n; i++) {
            imos[compress.get(lefts[i])]++;
            imos[compress.get(rights[i])]--;
        }
        int max = 0;
        for (int i = 1; i < idx; i++) {
            imos[i] += imos[i - 1];
            max = Math.max(max, imos[i]);
        }
        System.out.println(max);
    }
}

class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    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();
    }
}