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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        PriorityQueue<Place> queue = new PriorityQueue<>();
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            int r = sc.nextInt();
            queue.add(new Place(1, i, x - r));
            queue.add(new Place(0, i, x + r));
        }
        HashSet<Integer> current = new HashSet<>();
        int ans = 0;
        while (queue.size() > 0) {
            Place x = queue.poll();
            if (x.type == 0) {
                current.remove(x.idx);
            } else {
                current.add(x.idx);
                ans = Math.max(ans, current.size());
            }
        }
        System.out.println(ans);
    }
    
    static class Place implements Comparable<Place> {
        int type;
        int idx;
        int value;
        
        public Place(int type, int idx, int value) {
            this.type = type;
            this.idx = idx;
            this.value = value;
        }
        
        public int compareTo(Place another) {
            if (value == another.value) {
                return type - another.type;
            } else {
                return value - another.value;
            }
        }
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
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 int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}