#include <bits/stdc++.h> using namespace std; #define int long long #define pll pair<int, int> #define mp make_pair #define pb push_back #define f first #define s second #define endl '\n' #define ld long double #define sz(x) static_cast<int>((x).size()) #define i5 tuple<int,int,int,int,int> #define all(x) x.begin(), x.end() #define iiii tuple<int, int,int,int> signed main(){ int n;cin>>n; vector<pll> v(n); for(int i=0;i<n;i++)cin>>v[i].f>>v[i].s; sort(all(v)); vector<pll> in={v[0]}; for(int i=1;i<n;i++){ if(v[i].f - in.back().f <= in.back().s - v[i].s)continue; while(!in.empty() and v[i].f - in.back().f <= v[i].s - in.back().s)in.pop_back(); in.pb(v[i]); } cout<<sz(in); }