# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N = int(input())
	imos = [0] * (10 ** 6)
	for i in range(N):
		x, r = getlist()
		x += 3 * 10 ** 5 + 10
		imos[2 * x - 2 * r + 1] += 1
		imos[2 * x + 2 * r] -= 1

	ans = 0
	for i in range(1, 10 ** 6):
		imos[i] += imos[i - 1]
		ans = max(ans, imos[i])

	print(ans)

if __name__ == '__main__':
	main()