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[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var s = ReadLine();
        var t = ReadLine();
        var rs = s.ToList();
        rs.Reverse();
        var st = 0;
        var rst = 0;
        for (var i = 0; i < n; ++i)
        {
            if (s[i] != t[i]) ++st;
            if (rs[i] != t[i]) ++rst;
        }
        var ans = int.MaxValue;
        if (st % 2 == 0) ans = Math.Min(ans, st);
        if (rst % 2 == 1) ans = Math.Min(ans, rst);
        WriteLine(ans);
    }
}