#include <iostream>
#include <map>
using namespace std;

int main(){
  int n;cin>>n;
  map<int,int> A;
  for(int i = 0; n > i; i++){
    int x,y;cin>>x>>y;
    A[(x-y)]++;
    A[(x+y)]--;
  }
  int nw = 0;
  int ans = 0;
  for(auto z: A) {
    nw += z.second;
    ans = max(nw,ans);
  }
  cout << ans << endl;
}