#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n,a[999999],b[999999],cnt=0;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i]>>b[i];
    }
    sort(a+1,a+n+1);
    sort(b+1,b+n+1);
    for(int i=1;i<=n;i+=0){
        for(int j=1;j<=n;j+=0){
            if(a[i]>b[j]){
                cnt++;
                j++;
            }
            else if(a[i]<b[i]){
                i++;
            }
        }
    }
    cout<<cnt;
    return 0;
}