import sys
input = sys.stdin.readline
from collections import *

N = int(input())
imos = [0]*(8*10**5+2)
cnt = defaultdict(int)

for _ in range(N):
    x, r = map(int, input().split())
    l = x-r+2*10**5
    r = x+r+2*10**5
    imos[2*l] += 1
    imos[2*r+1] -= 1

for i in range(1, 8*10**5+2):
    imos[i] += imos[i-1]

print(max(imos))