#include <iostream>
#include <vector>
using namespace std;
int main(){
	int N;
	cin >> N;
	vector<int> S(N);
	for (int i = 0; i < N; i++){
		cin >> S[i];
	}
	vector<int> T(N);
	for (int i = 0; i < N; i++){
		cin >> T[i];
	}
	vector<int> A(3, 0);
	for (int i = 0; i < N; i++){
		A[S[i]]++;
	}
	vector<int> B(3, 0);
	for (int i = 0; i < N; i++){
		B[T[i]]++;
	}
	if (A[2] > 0 && B[2] > 0){
		cout << N * (A[2] + B[2]) - A[2] * B[2] << endl;
	}
	if (A[2] > 0 && B[2] == 0){
		cout << N * A[2] + A[1] << endl;
	}
	if (A[2] == 0 && B[2] > 0){
		cout << N * B[2] + B[1] << endl;
	}
	if (A[2] == 0 && B[2] == 0){
		cout << max(A[1], B[1]) << endl;
	}
}