#include <iostream>
#include <set>
#include <queue>

using namespace std;

int main(){
    multiset<int> b;
    priority_queue<int,vector<int>,greater<int>> a;
    int n,ans=0;
    cin>>n;
    for(int i=0;i<n;i++){
        int ai;
        cin>>ai;
        a.push(ai);
    }
    while(a.size()){
        int ai=a.top();a.pop();
        int bi;
        cin>>bi;
        b.insert(bi);
        ans+=distance(b.begin(),b.lower_bound(ai));
    }
    cout<<ans<<endl;

    return 0;
}