#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
// #define dbg(v) cout << #v << " = " << v << "\n";
int main() {
int n;
cin >> n;
// vector<int> best(n, 0);
int last = -2000000;
int v = 0;
for (int i = 0; i < n; i++) {
int l, r;
cin >> l >> r;
// dbg(i);
// dbg(l);
// dbg(last);
if (i-l > last) {
last = i;
v++;
}
// if (i > 0) best[i] = best[i-1];
// best[i] = max(best[i], (i-l-1 >= 0 ? best[i-l-1] : 0)+1);
}
// for (int v: best) dbg(v);
// cout << best.back() << "\n";
cout << v << "\n";
return 0;
}
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