#include <bits/stdc++.h>
using namespace std;
const int INF = 10000000;
int main(){
  int N;
  cin >> N;
  string S;
  cin >> S;
  string T;
  cin >> T;
  int cnt1 = 0;
  for (int i = 0; i < N; i++){
    if (S[i] != T[i]){
      cnt1++;
    }
  }
  int cnt2 = 0;
  for (int i = 0; i < N; i++){
    if (S[i] != T[N - 1 - i]){
      cnt2++;
    }
  }
  int ans = INF;
  if (cnt1 % 2 == 0){
    ans = min(ans, cnt1);
  }
  if (cnt2 % 2 == 1){
    ans = min(ans, cnt2);
  }
  cout << ans << endl;
}