#include<bits/stdc++.h>
using namespace std;
signed main() {
int n; cin >> n;
vector<int> l(n), r(n);
for(int i=0; i<n; i++) cin >> l[i] >> r[i];
vector<int> dp(n, 1);
for(int i=0; i<n; i++) {
for(int j=0; j<i; j++) {
if(j+r[j] < i && j < i-l[i]) dp[i]=max(dp[i], dp[j]+1);
else dp[i]=max(dp[i], dp[j]);
}
}
cout << dp[n-1];
return 0;
}
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