#include <bits/stdc++.h>
#include <atcoder/all>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n, m) for (int i = (int)(n); i > (int)(m); i--)
using namespace atcoder;
using ll = long long;
const ll MOD1 = 1000000007LL;
const ll MOD2 = 998244353LL;
using namespace std;
const vector<pair<int, int>> dpos4 = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
// const vector<pair<int, int>> dpos8 = {{-1, -1}, {-1, 0}, {-1, 1}, {0, -1}, {0, 1}, {1, -1}, {1, 0}, {1, 1}};
template <typename T>
bool chmax(T &a, const T &b) {
    if (a < b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}
template <typename T>
bool chmin(T &a, const T &b) {
    if (a > b) {
        a = b;  // aをbで更新
        return true;
    }
    return false;
}


int main() {
    int N;
    cin >> N;
    string S, T;
    cin >> S >> T;
    ll ans = 1e18;
    ll cnt = 0;
    rep(i, N){
        if(S[i] != T[i]) cnt++;
    }
    if(cnt % 2 == 0) chmin(ans, cnt);
    cnt = 0;
    rep(i, N){
        if(S[N - 1 - i] != T[i]) cnt++;
    }
    if(cnt % 2 == 1) chmin(ans, cnt);
    cout << ans << endl;
	return 0;
}