#include <bits/stdc++.h>
using namespace std;
int main() {
int n; cin >> n;
vector<pair<int, int>> flowers(n+1, {INT_MAX, INT_MAX});
vector<int> dp(n, 1);
for(int i = 0; i < n; i++)
cin >> flowers[i].first >> flowers[i].second;
for (int i=0; i<n; i++) {
for (int j=max(0,i-5); j<i; j++) {
if (j+max(flowers[j].second, flowers[i].first)<i)
dp[i]= max(dp[i], dp[j]+1);
}
}
cout << *max_element(dp.begin(), dp.end())<< endl;
}
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