#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int n;
  cin >> n;
  constexpr int m = 4e5 + 5;
  constexpr int pos = 2e5 + 2;
  vector<int> cnt(m, 0);
  rep(i, n) {
    int x, r;
    cin >> x >> r;
    cnt[x - r + pos]++, cnt[x + r + pos]--;
  }
  rep(i, m - 1) cnt[i + 1] += cnt[i];
  cout << *max_element(cnt.begin(), cnt.end()) << '\n';
  return 0;
}