#include<bits/stdc++.h>
using namespace std;
using LL = long long;
using ULL = unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main() {
	int N; cin >> N;
	int S[3] = {}, T[3] = {};
	rep(i, N) { int s; cin >> s; S[s]++; }
	rep(i, N) { int s; cin >> s; T[s]++; }
	int ans = 0;
	ans += S[2] * N + T[2] * N - S[2] * T[2];
	int tmp = 0;
	if (S[2] == 0) tmp = max(tmp, T[1]);
	if (T[2] == 0) tmp = max(tmp, S[1]);
	ans += tmp;
	cout << ans << endl;
	return 0;
}