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

int main()
{
	int N;
	cin >> N;
	vector<int> x( N );
	vector<int> r( N );
	for( int i = 0; i < N; i++ ) {
		cin >> x[i] >> r[i];
	}

	const int n = 100000;
	vector<int> a( 2 * n + 2 );
	for( int i = 0; i < N; i++ ) {
		int l = max( 0, x[i] - r[i] + n );
		int rr = x[i] + r[i] + 1 + n;
		a[l]++;
		if( rr < 2 * n + 2 ) a[rr]--;
	}

	for( int i = 0; i < 2 * n + 2 - 1; i++ ) {
		a[i + 1] += a[i];
	}
	int ans = 0;
	for( int i = 0; i < 2 * n + 2; i++ ) {
		ans = max( ans, a[i] );
	}

	cout << ans << endl;
}