#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e5 + 7;
struct A {
    int l, r;
} strick[MAXN];
bool cmp(A x, A y) { return x.l < y.l; }
int n, ans, tmp;
int main() {
    cin >> n;
    for (int i = 0; i < n; i++) cin >> strick[i].l >> strick[i].r;
    sort(strick, strick + n, cmp);
    for (int i = 0; i < n; i++) {
        int cnt = 0;
        if (strick[i].l > tmp) {
            tmp = strick[i].r;
            ans++;
        }
    }
    cout << ans return 0;
}

/sandbox/1/a.cpp: In function 'int main()':
/sandbox/1/a.cpp:20:16: error: expected ';' before 'return'
   20 |     cout << ans
      |                ^
      |                ;
   21 |     return 0;
      |     ~~~~~~