#include <bits/stdc++.h>
using namespace std;
const int INF = 1000000;
int main(){
  int N;
  cin >> N;
  vector<int> x(N), r(N);
  for (int i = 0; i < N; i++){
    cin >> x[i] >> r[i];
  }
  vector<int> L(N), R(N);
  for (int i = 0; i < N; i++){
    L[i] = x[i] - r[i];
    R[i] = x[i] + r[i];
  }
  vector<int> X;
  for (int i = 0; i < N; i++){
    X.push_back(L[i]);
    X.push_back(R[i]);
  }
  sort(X.begin(), X.end());
  X.erase(unique(X.begin(), X.end()), X.end());
  int cnt = X.size();
  for (int i = 0; i < N; i++){
    L[i] = lower_bound(X.begin(), X.end(), L[i]) - X.begin();
    R[i] = lower_bound(X.begin(), X.end(), R[i]) - X.begin();
  }
  vector<int> imos(cnt + 1, 0);
  for (int i = 0; i < N; i++){
    imos[L[i]]++;
    imos[R[i]]--;
  }
  for (int i = 0; i < cnt; i++){
    imos[i + 1] += imos[i];
  }
  int ans = 0;
  for (int i = 0; i < cnt; i++){
    ans = max(ans, imos[i]);
  }
  cout << ans << endl;
}