#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<int> v(400001, 0);
    for (int i = 0; i < n; ++i)
    {
        int x, r;
        cin >> x >> r;
        x += 200000;
        ++v[x - r];
        --v[x + r];
    }

    int res{ 0 };
    for (size_t i = 1; i < v.size(); ++i)
    {
        v[i] += v[i - 1];
        res = max(res, v[i]);
    }

    cout << res << "\n";

    return 0;
}