func main()
	var n: int :: cui@inputInt()
	var dc: []int :: #[500000]int
	for i(0, n - 1)
		var x: int :: cui@inputInt()
		var r: int :: cui@inputInt()
		do dc[x - r + 250000] :+ 1
		do dc[x + r + 250000] :- 1
	end for
	
	var ans: int :: 0
	var cnt: int :: 0
	for i(0, 499999)
		do cnt :+ dc[i]
		do ans :: [ans, cnt].max()
	end for
	do cui@print("\{ans}\n")
end func