using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var s = NList;
        var t = NList;
        var s2c = s.Count(c => c == 2);
        var t2c = t.Count(c => c == 2);
        if (s2c > 0 && t2c > 0)
        {
            WriteLine(s2c * n + t2c * n - s2c * t2c);
        }
        else if (s2c > 0)
        {
            var s1c = s.Count(c => c == 1);
            WriteLine(s2c * n + s1c);
        }
        else if (t2c > 0)
        {
            var t1c = t.Count(c => c == 1);
            WriteLine(t2c * n + t1c);
        }
        else
        {
            var s1c = s.Count(c => c == 1);
            var t1c = t.Count(c => c == 1);
            WriteLine(Math.Max(s1c, t1c));
        }
    }
    static long GCD(long a, long b)
    {
        if (a < b) return GCD(b, a);
        if (a % b == 0) return b;
        return GCD(b, a % b);
    }
}