import sys
import io, os
input = sys.stdin.buffer.readline

n = int(input())
M = 2*10**5
imos = [0]*(2*M+2)
for i in range(n):
    x, r = map(int, input().split())
    a = x-r+M
    b = x+r+M
    imos[a] += 1
    imos[b] -= 1
from itertools import accumulate
imos = list(accumulate(imos))
ans = max(imos)
print(ans)