#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n;
    cin >> n;
    vector<int>s(n);
    vector<int>t(n);
    int sum1 = 0;
    int sum2 = 0;
    for(int i=0; i<n; i++)
    {
        cin >> s[i];
        if(s[i]==2)sum1 += n;
        else sum1 += s[i];
    }
    for(int i=0; i<n; i++)
    {
         cin >> t[i];
        if(t[i]==2)sum2 += n;
        else sum2 += s[i];
    }

    cout << max(sum1,sum2) << endl;
}