#include <bits/stdc++.h> using namespace std; typedef long long ll; struct Resident { ll l, r; bool operator<(const Resident& other) const { if (l != other.l) return l < other.l; return r > other.r; } }; int main() { ios::sync_with_stdio(0); cin.tie(0); int n; cin >> n; vector<Resident> a(n); for(int i=0; i<n; i++) { ll x, e; cin >> x >> e; a[i].l = x - e; a[i].r = x + e; } sort(a.begin(), a.end()); int ans = 0; ll max_r = -2e18; for(int i=0; i<n; i++) { if (a[i].r > max_r) { ans++; max_r = a[i].r; } } cout << ans << endl; return 0; }