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

public class Main {
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		// 入力
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] X = new int[N];
		int[] R = new int[N];
		for(int i = 0; i < N; i++){
			X[i] = sc.nextInt();
			R[i] = sc.nextInt();
		}
		
		// 円の左端、右端配列を作成
		int[] left = new int[N];
		int[] right = new int[N];
		for(int i = 0; i < N; i++){
			left[i] = X[i] - R[i];
			right[i] = X[i] + R[i];
		}
		Arrays.sort(left);
		Arrays.sort(right);
		
		// 重なり合う円のカウント
		int circle = 0;
		int max = 0;
		int indexL = 0;
		int indexR = 0;
		while(indexL < N && indexR < N){
			if(indexL == N){
				circle--;
				indexR++;
			}
			else if(indexR == N){
				circle++;
				indexL++;
			}
			else if(left[indexL] < right[indexR]){
				circle++;
				indexL++;
			}
			else{
				circle--;
				indexR++;
			}
			
			if(max < circle){
			  max = circle;
			}
		}
		
		
		// 出力
		System.out.println(max);
	}

}