#include<bits/stdc++.h>
using namespace std;
int main(){
ios_base::sync_with_stdio(false);cin.tie(0);
int n;
cin>>n;
pair<int,int> swords[n];
for(int i=0;i<n;i++){//the details of each sword...
cin>>swords[i].first>>swords[i].second;//the attack, and the defence...
}
sort(swords,swords+n);
int max_defence=0;
int useful_swords=0;
for(int i=n-1;i>=0;i--){
if(swords[i].second>max_defence){
max_defence=swords[i].second;
useful_swords++;
}//else, there is a sword with greater i (and therefore >=attack) and stronger defence (max defence)
//which makes this sword useless
}
cout<<useful_swords;
return 0;
}
