#include <bits/stdc++.h>   using namespace std;   vector<pair<int, int> > Dates;   int n, x, y, ans, cur;   int main() {     std::ios_base::sync_with_stdio(false);     cin >> n;     for (int i = 0; i < n; i++) {       cin >> x >> y;       Dates.push_back(make_pair(x, y));     }     sort(Dates.begin(), Dates.end());     for (int i = 0; i < Dates.size(); i++) {       if (Dates[i].second > cur)         cur = Dates[i].second;       else if (Dates[i].second < cur) {         ans++;       }     }     cout << ans << endl;   }   