#include<bits/stdc++.h>
using namespace std;

const long long MaxN = 1e5 + 5;

long long n;
pair<long long,long long> a[MaxN];

int main()
{
    if(fopen("stline.inp","r"))
    {
        freopen("stline.inp","r",stdin);
        freopen("stline.out","w",stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;

    for(long long i=1; i<=n; i++)
    {
        cin >> a[i].first >> a[i].second;
    }

    sort(a+1,a+n+1);

    long long ans=0;
    long long x=a[1].second;

    for(long long i=2; i<=n; i++)
    {
        if(a[i].first<x)
        {
            ans++;
            x=min(x,a[i].second);
        }
        else
        {
            x=a[i].second;
        }
    }

    cout << ans;

    return 0;
}