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

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        var s = Console.ReadLine().Trim();
        var t = Console.ReadLine().Trim();
        getAns(n, s, t);
    }
    static void getAns(int n, string s, string t)
    {
        var cs1 = s.Count(x => x == '1');
        var ct1 = t.Count(x => x == '1');
        var d = Abs(cs1 - ct1);
        var c = 0;
        if (d % 2 == 0)
        {
            for (int i = 0; i < n; i++)
            {
                if (s[i] != t[i]) c++;
            }
        }
        else
        {
            var t2 = t.ToCharArray();
            Array.Reverse(t2);
            for (int i = 0; i < n; i++)
            {
                if (s[i] != t2[i]) c++;
            }
        }
        Console.WriteLine(c);
    }
}