#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    map<int, int> m;
    for (int i = 0; i < n; i++) {
        int x, r;
        cin >> x >> r;
        m[x - r]++;
        m[x + r]--;
    }
    
    int incircle = 0, ans = 0;
    for (auto t : m) {
        int v = t.second;
        incircle += v;
        ans = max(ans, incircle);
    }
    cout << ans << endl;
}