#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) for(int i=0 ; (i)<(int)(n) ; (i)++)

int main(void){
    int n;
    cin >> n;
    vector<pair<int, int>> rr(n);
    REP(i, n) cin >> rr.at(i).first >> rr.at(i).second;
    
    sort(rr.begin(), rr.end());
    int ans = 0, tmp = 0;
    for(auto i : rr){
        if(tmp > i.first){
            ans++;
            continue;
        }
        tmp = i.second;
    }
    cout << ans << endl;
}