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

int main(){
    int N;
    cin >> N;
    vector<int> circ(500001);
    vector<int> cnt(500002);
    for(int i=0;i<500001;i++){
        circ[i]=0;
    }
    int x,r;
    for(int i=0;i<N;i++){
        cin >> x >> r;
        x = x+200000;
        circ[x-r]++;
        circ[x+r]--;
    }
    cnt[0] = 0;
    for(int i=0;i<500001;i++){
        cnt[i+1] = cnt[i]+circ[i];
    }
    int max=0;
    for(int i=0;i<500002;i++){
        if(cnt[i] > max){
            max = cnt[i];
        }
    }
    cout << max << endl;
}