#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  string S,T;
  cin>>S>>T;
  int a = 0, b = 0;
  for(int i=0;i<N;i++){
      a += (S[i] != T[i]);
      b += (S[i] != T[N-i-1]);
  }
  int ans = 1e18;
  if(a%2 == 0) ans = min(ans,a);
  if(b%2) ans = min(ans,b);
  cout<<ans<<endl;
}