#include <bits/stdc++.h>

using namespace std;

using ll = long long;

#define sz(a) (int)(a.size())
#define debug(x) cout << "> " << (#x) << " = " << x << endl;
#define all(a) (a).begin(), (a).end()

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n;
  cin >> n;
  string s, t;
  cin >> s >> t;
  int cnt1 = 0, cnt2 = 0;
  int bal = 0;
  for (int i = 0; i < n; i++) {
    if (s[i] != t[i]) {
      cnt1++;
      bal ^= 1;
    }
    if (s[i] != t[n - i - 1]) {
      cnt2++;
    }
  }
  if (!bal) cout << cnt1 << "\n";
  else cout << cnt2 << "\n";
}