#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int s[3];
int t[3];

int main(){
    int n;
    cin >> n;
    rep(i,n){
        int ss;
        cin >> ss;
        s[ss] ++;
    }
    rep(i,n){
        int tt;
        cin >> tt;
        t[tt] ++;
    }
    if(t[2]>0&&s[2]>0){
        cout << (t[2]+s[2])*n - t[2] - s[2] << endl;
    }else if(t[2]>0){
        cout << t[2]*n + t[1] << endl;
    }else if(s[2]>0){
        cout << s[2]*n + s[1] << endl;
    }else{
        cout << max(s[1],t[1]) << endl;
    }

    return 0;
}