#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#define overload3(_1, _2, _3, name, ...) name
#define rep1(n) for(ll _ = 0; _ < (n); ++_)
#define rep2(i, n) for(ll i = 0; i < (n); ++i)
#define rep3(i, a, b) for(ll i = (a); i < (b); ++i)
#define rep(...) overload3(__VA_ARGS__, rep3, rep2, rep1)(__VA_ARGS__)

#define all(x) (x).begin(), (x).end()
template <class T> using vec = vector<T>;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int N;
    cin >> N;
    string S, T;
    cin >> S >> T;
    string S_rev = S, T_rev = T;
    reverse_copy(all(S), S_rev.begin());
    reverse_copy(all(T), T_rev.begin());
    // cout << S << "\n" << S_rev << "\n";
    int cnt = 0, revcnt = 0;
    rep(i, N){
        if(T[i] != S[i]) ++cnt;
        if(T[i] != S_rev[i]) ++revcnt;
    }
    if(T != T_rev){
        if(cnt % 2 == 1) ++cnt;
        if(revcnt % 2 == 0) ++revcnt;
    }
    cout << min(cnt, revcnt) << "\n";
}