#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int co[400040] = { 0 };
int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        int x, r;
        cin >> x >> r;
        co[x - r + 200000]++;
        co[x + r + 200000]--;
    }
    int ans = 0, c = 0;
    for (int i = 0; i < 400040; i++) {
        c += co[i];
        if (c > ans) {
            ans = c;
        }
    }
    cout << ans << endl;
    return 0;
}