package main

import (
	"fmt"
	"bufio"
	"os"
	"sort"
)

func main() {
	r := bufio.NewReader(os.Stdin)
	w := bufio.NewWriter(os.Stdout)
	defer w.Flush()
	var N int
	fmt.Fscan(r, &N)
	coord := make([][2]int, N*2)
	for i := 0; i < N; i++ {
		var x, radius int
		fmt.Fscan(r, &x, &radius)
		coord[2*i] = [2]int{x-radius, 1}
		coord[2*i+1] = [2]int{x+radius, -1}
	}
	sort.Slice(coord, func(i, j int) bool {if coord[i][0] < coord[j][0] { return true } else if coord[i][0] > coord[j][0] { return false } else { return coord[i][1] < coord[j][1]} })
	cnt := 0
	maxcnt := -1
	for _, d := range coord {
		cnt += d[1]
		if cnt > maxcnt {
			maxcnt = cnt
		}
	}
	fmt.Fprintln(w, maxcnt)
}