#ifndef hari64
#include <bits/stdc++.h>
// #pragma GCC target("avx2")
// #pragma GCC optimize("O3")
// #pragma GCC optimize("unroll-loops")
#define debug(...)
#else
#include "util/viewer.hpp"
#define debug(...) viewer::_debug(__LINE__, #__VA_ARGS__, __VA_ARGS__)
#endif
using namespace std;
constexpr int INF = 1001001001;
constexpr long long INFll = 1001001001001001001;
template <class T>
bool chmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0;
}
template <class T>
bool chmin(T& a, const T& b) {
    return a > b ? a = b, 1 : 0;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;
    string S, T;
    cin >> S >> T;

    int diff = 0;
    for (int i = 0; i < N; i++) {
        if (S[i] != T[i]) {
            diff++;
        }
    }
    if (diff % 2 == 0) {
        cout << diff << endl;
        return 0;
    }

    reverse(S.begin(), S.end());

    int diff2 = 0;
    for (int i = 0; i < N; i++) {
        if (S[i] != T[i]) {
            diff2++;
        }
    }
    if (diff2 % 2 == 1) {
        cout << diff2 << endl;
        return 0;
    }

    assert(false);

    return 0;
}