#include <iostream>
#include <sstream>
#include <vector>
#include <map>
#include <algorithm>
#include <set>
#include <stack>
#include <queue>
#include <cmath>
#include <iomanip>
#include <numeric>
#include <string>
#include <bitset>
#include <assert.h>
#include <functional>
#include <random>

// #define _GLIBCXX_DEBUG
// #define _LIBCPP_DEBUG 0
#define _GLIBCXX_DEQUE_BUF_SIZE 64

#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define revrep(i, n) for(int i = (int)(n - 1); i >= 0; --i)
#define range(i, s, t) for (int i = (int)(s); i < (int)(t); ++i)
#define revrange(i, s, t) for(int i = (int)(t - 1); i >= (int)(s); --i)
#define srange(i, s, t, step) for(int i = (int)(s); i < (int)(t); i+=int(step))
#define popcnt(x) __builtin_popcountll(x)
#define hayai std::ios::sync_with_stdio(false);std::cin.tie(nullptr)
#define SORT(x) sort(x.begin(), x.end())
#define ERASE(x) x.erase(unique(x.begin(), x.end()), x.end())

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using pll = pair<long long, long long>;
template<class T> inline bool chmax(T& a, T b){ if (a < b){ a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b){ if (a > b){ a = b; return true; } return false; }
inline bool inside(int x, int y, int h, int w) { return (x >= 0 && x < h && y >= 0 && y < w); }
constexpr pair<int, int> dydx4[] = { {0, 1}, {-1, 0}, {0, -1}, {1, 0}, };   //RULD
constexpr pair<int, int> dydx8[] = { {0, 1},{-1, 1},{-1, 0},{-1, -1},{0, -1},{1, -1},{1, 0},{1, 1}, };

namespace tktk {

void inline print() { cout << '\n'; }

template<class Head, class... Tail>
void print(Head&& head, Tail&&... tail) {
    cout << head;
    if(sizeof...(tail) != 0) cout << " ";
    print(forward<Tail>(tail)...);
}

template<class T> 
void print(vector<T> &vec) {
    for(auto &a: vec) {
        cout << a;
        if(&a != &vec.back()) cout << " ";
    }
    cout << endl;
}

template<class T>
void print(vector<vector<T>> &mat) {
    for(auto &vec: mat) {
        print(vec);
    }
}

}   //tktk


void solve() {
    int n;
    cin >> n;
    string s, t;
    cin >> s >> t;

    int ans = 100 * n;

    int cnt = 0;
    rep(i, n) cnt += s[i] != t[i];
    if(cnt % 2 == 0) {
        chmin(ans, cnt);
    }

    cnt = 0;
    reverse(s.begin(), s.end());
    rep(i, n) cnt += s[i] != t[i];
    if(cnt % 2 == 1) {
        chmin(ans, cnt);
    }
    cout << ans << endl;
}

int main() {
    hayai;
    // int t;
    // cin >> t;
    // rep(i, t) solve();
    solve();
}