C++ :

#include<bits/stdc++.h>
using namespace std;
using LL=long long;
using PLL=pair<LL,LL>;
const LL INF=0x3f3f3f3f3f3f3f3f;
const double EPS=1e-10;

const int N=1e5+10;
LL a[N];

void solve() {
	LL n;
	cin>>n;
	for (LL i=1; i<=n; i++)  {
		LL x;
		cin>>x>>a[i];
	}
	
	LL ans=1;
	LL slow=a[n];
	for (LL i=n-1; i>=1; i--) {
		if (a[i]>slow) {
			//cows group up
		} else {
			ans++;
		}
		slow=min(slow, a[i]);
	}
	
	cout<<ans<<"\n";
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie (0);
	
	//freopen("cowjog.in", "r", stdin);
	//freopen("cowjog.out", "w", stdout);

	int T=1;
	//cin>>T;
	for (int i=1; i<=T; i++) {
		//cout<<i<<"\n";
	    solve();
	}
	return 0;
}