#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	ll n;
	cin >> n;

	vector<ll> a(n), b(n);
	rep(i, n) cin >> a[i];
	rep(i, n) cin >> b[i];

	sort(a.begin(), a.end());
	multiset<ll> ms;
	vector<ll> v;

	ll ans = 0;
	rep(i, n){
		ms.insert(b[i]);
		while(!ms.empty() && *ms.begin() < a[i]){
			ll t = *ms.begin();
			v.push_back(t);
			ms.erase(ms.begin());
		}
		ans += (ll) v.size();
	}
	
	cout << ans << endl;
}