#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
#define INF 1000000001LL
#define LNF 1000000000000000001LL
#define MOD 1000000007LL
#define MAX 300005
#define long long long
#define all(x) x.begin(),x.end()
using namespace std;
int main()
{
	ios_base::sync_with_stdio(0); 
    cin.tie(0);

    int n;
    cin >> n;

    vector<pair<long,long>> arr(n);

    for(int i = 0; i<n; i++)
        cin >> arr[i].second >> arr[i].first;
    sort(all(arr));

    int p = 0;
    int res = 0;
    for(int i = 0; i<n; i++)
    {
        if(arr[i].second >= p)
        {
            res++;
            p = arr[i].first;
        }
    }
    cout << n-res << endl;
    


    return 0;
}