#include <bits/stdc++.h>
#define ll long long
using namespace std;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
ll n, res = 1;
cin >> n;
ll l[n+1], r[n+1], dp[n+1];
for (ll i = 1; i <= n; i++)
{
cin >> l[i] >> r[i];
dp[i] = 0;
}
dp[0] = 0;
dp[1] = 1;
for (ll i = 2; i <= n; i++)
{
for (ll j = 1; j < i; j++)
{
if (i - j >= l[i] + 1 && i - j >= r[j] + 1)
dp[i] = dp[j] + 1;
else dp[i] = max(dp[i], dp[i-1]);
}
res = max(res, dp[i]);
}
cout << res;
return 0;
}
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