#[macro_export]
macro_rules! read_line {
    ($($xs: tt)*) => {
        let mut buf = String::new();
        std::io::stdin().read_line(&mut buf).unwrap();
        let mut iter = buf.split_whitespace();
        expand!(iter, $($xs)*);
    };
}

#[macro_export]
macro_rules! expand {
    ($iter: expr,) => {};
    ($iter: expr, mut $var: ident : $type: tt, $($xs: tt)*) => {
        let mut $var = value!($iter, $type);
        expand!($iter, $($xs)*);
    };
    ($iter: expr, $var: ident : $type: tt, $($xs: tt)*) => {
        let $var = value!($iter, $type);
        expand!($iter, $($xs)*);
    };
}

#[macro_export]
macro_rules! value {
    ($iter:expr, ($($type: tt),*)) => {
        ($(value!($iter, $type)),*)
    };
    ($iter: expr, [$type: tt; $len: expr]) => {
        (0..$len).map(|_| value!($iter, $type)).collect::<Vec<_>>()
    };
    ($iter: expr, Chars) => {
        value!($iter, String).unwrap().chars().collect::<Vec<_>>()
    };
    ($iter: expr, $type: ty) => {
        if let Some(v) = $iter.next() {
            v.parse::<$type>().ok()
        } else {
            None
        }
    };
}

fn main() {
    read_line!(n: usize,);
    read_line!(s: String,);
    read_line!(t: String,);
    let n = n.unwrap();
    let s = s.unwrap().chars().collect::<Vec<_>>();
    let mut t = t.unwrap().chars().collect::<Vec<_>>();
    let mut ans = 1usize << 60;

    {
        let temp = (0..n).filter(|&i| s[i] != t[i]).count();
        if temp % 2 == 0 {
            ans = temp;
        }
    }

    t.reverse();

    {
        let temp = (0..n).filter(|&i| s[i] != t[i]).count();
        if temp % 2 == 1 && temp < ans {
            ans = temp;
        }
    }

    println!("{}", ans);
}