#include <bits/stdc++.h>
using namespace std;
int main() {
int n, y; cin >> n;
vector<int> v(n), tab(n, 1);
for (int i=0; i<n; i++) cin>>v[i]>>y;
for(int i=0;i<n;i++){
if(i - v[i] >0)
tab[i]= max(tab[i],tab[i-v[i]-1]+1);
}
sort(tab.begin(),tab.end());
cout<< tab.back()<<endl;
}
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