#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  map<int, int> in;
  
  cin >> n;
  REP (i, n) {
    int x, r;
    cin >> x >> r;
    in[x-r]++;
    in[x+r]--;
  }

  int ret = 0;
  int cur = 0;
  for (int x = -200010; x <= 200010; x++) {
    cur += in[x];
    ret = max(ret, cur);
  }
  cout << ret << endl;

  return 0;
}