#include<bits/stdc++.h>
using namespace std;
pair <int,int> a[100005];
int cnt=0,n;
int main()
{
    if (fopen("stline.inp", "r"))
    {
        freopen("stline.inp", "r", stdin);
        freopen("stline.out", "w", stdout);
    }
    cin >> n;
    for (int i=1; i<=n; i++)
    {
        cin >> a[i].first >> a[i].second;
    }
    sort(a+1,a+n+1);
    for (int i=2; i<=n; i++)
    {
        if (a[i].first<a[i-1].second)
        {
            cnt++;
            if (a[i].second>a[i-1].second)
            {
                a[i].second = a[i-1].second;
            }
        }
    }
    cout << cnt;
}