#include<bits/stdc++.h>
using namespace std;
int mn[200005];
int inf=1e9+5;
vector<pair<int,int>>v;
vector<int>val;
int main(){
int n;cin>>n;
for(int i=1;i<=n;i++){
int x,y;cin>>x>>y;
v.push_back({x,y});
val.push_back(y);
}
sort(val.begin(),val.end());
sort(v.begin(),v.end());
for(int i=0;i<n;i++)mn[i]=inf;
for(int i=0;i<n;i++){
v[i].second=lower_bound(val.begin(),val.end(),v[i].second)-val.begin()+1;
}
int ans=0;
for(int i=0;i<n;i++){
for(int j=0;j<i;j++){
if(v[j].second<v[i].second&&mn[j]>v[i].second)ans++,mn[j]=v[i].second;
}
}
cout<<ans;
}
