#include <bits/stdc++.h> using namespace std; const int N = 500005; const long long oo = 1e18; int n; array<int, 2> a[N]; signed main(void) { ios::sync_with_stdio(false); cin.tie(nullptr); cin >> n; for (int i = 1, x, e; i <= n; i++) { cin >> x >> e; a[i] = {x - e, -x - e}; } sort(a + 1, a + 1 + n); int ans = 0; int mn = 2e9 + 1; for (int i = 1; i <= n; i++) { if (mn > a[i][1]) { ans++; mn = a[i][1]; } } cout << ans; return 0; }