#include <bits/stdc++.h>

using namespace std;

int main(){
	ios::sync_with_stdio(false);

	int n, counter=0, maxc = 0;
	long long x,y;
	vector <pair<long long, int>> eventos;
	cin >> n;

	eventos.resize(2*n);
	for(int i = 0; i < 2*n; i+= 2){
		cin >> x >> y;
		eventos[i] = {x,1};
		eventos[i+1] = {x+y,0};
	}
	sort(eventos.begin(), eventos.end());

	for(int i = 0; i < 2*n; i++){
		if(eventos[i].second == 1){
			counter++;
		}else{
			counter--;
		}

		maxc = max(maxc, counter);
	}

	cout << maxc << '\n';

	return 0;
}