#include<bits/stdc++.h>
using namespace std;
int n, ans = 0;
struct s{
    int fir,end;
};
int main(){
    s a[1000005];
    cin >> n;
    for(int i = 1;i <= n;i++){
        cin >> a[i].fir >> a[i].end;
    }
    for(int i = 1;i <= n;i++){
        if(i == 1 || a[i].fir >= a[i - 1].end){
            ans++;
        }
    }
    cout << ans;
    return 0;
}