/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.07.29 01:36:27
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n;
    cin >> n;
    vector< int > d(200001,0);
    for (int i = 0; i < n; i++) {
        int x, r;
        cin >> x >> r;
        d[max(0, x + 100000 - r)]++;
        if (x + r <= 100000) d[x + 100000 + r]--;
    }
    int ans = d[0];
    for (int i = 0; i < 200000; i++) {
        d[i + 1] += d[i];
        ans = max(ans, d[i + 1]);
    }
    cout << ans << endl;
    return 0;
}