//#define _GLIBCXX_DEBUG #include <bits/stdc++.h> #define int long long using namespace std; struct node { int color; pair<int,int> sect; node() = default; node(int val,int l,int r) : color(val), sect(l,r) {} }; signed main() { ios_base::sync_with_stdio(false); cin.tie(NULL); int n; cin >> n; vector <pair<int,int>> vec(n); for (int i = 0;i < n;i++) { cin >> vec[i].second >> vec[i].first; } sort(vec.begin(), vec.end()); int ans = 1; for (int i = n - 2;i >= 0;i--) { bool is_free = 0; for (int j = i + 1;j < n;j++) { int er = vec[j].first - vec[i].first; int xr = abs(vec[j].second - vec[i].second); if (xr <= er) { is_free = 1; } } if (!is_free) { ans++; } } cout << ans << '\n'; }