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

using namespace std;

typedef long long ll;

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);

	int n;
	cin >> n;

	vector<int> s(n), t(n);
	rep(i, n) cin >> s[i];
	rep(i, n) cin >> t[i];

	int s2cnt = 0, t2cnt = 0;
	rep(i, n) if(s[i] == 2) s2cnt++;
	rep(i, n) if(t[i] == 2) t2cnt++;

	ll ans = 0;
	ans += s2cnt * n;
	ans += t2cnt * (n - s2cnt);

	if(s2cnt == 0 && t2cnt > 0){
		rep(i, n) if(t[i] == 1) ans++;
	}else if(s2cnt > 0 && t2cnt == 0){
		rep(i, n) if(s[i] == 1) ans++;
	}else if(s2cnt == 0 && t2cnt == 0){
		ll m1 = 0, m2 = 0;
		rep(i, n) if(s[i] == 1) m1++;
		rep(i, n) if(t[i] == 1) m2++;
		ans += max(m1, m2);
	}

	cout << ans << endl;
}