#include <bits/stdc++.h> 
using namespace std;
using ll =long long;
#define all(v) v.begin(),v.end()
 #define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)

int main() {
    ll N;cin>>N;
    string S,T;cin>>S>>T;
    
    ll a=0;
    for(ll i=0;i<N;i++) {
      if(S[i]!=T[i]) a++;
    }
  
  ll b=0;
  reverse(all(S));
  for(ll i=0;i<N;i++) {
    if(S[i]!=T[i]) b++;
  }

  if(a%2==0&&b%2!=0) {
    cout<<min(a,b)<<endl;
  }
  else if(a%2==0) {
    cout<<a<<endl;
  }
  else cout<<b<<endl;
}