#include <bits/stdc++.h>
using namespace std;
#define boost   ios::sync_with_stdio(0);cin.tie(0);
#define file    freopen("in.txt","r",stdin); freopen("out.txt","w",stdout);

#define pb  push_back
#define mp  make_pair
#define ins insert
#define int long long
#define uint unsigned long long

#define pii pair<int,int>
#define st  set<int>

#define get(arr)  for(auto& v:arr){cin>>v;}
#define all(x)   (x).begin(),(x).end()
#define sz(x)    (x).size()
#define fix(a,b) setprecision(a)<<fixed<<(b)
#define drop(x)  cout<<(x)<<endl;return;
#define print(x,a,b) for(auto v:(x)){cout<<(v)<<(a);}cout<<(b)
#define INF 1e9
string alpha="abcdefghijklmnopqrstuvwxyz";
const long long mod=12345;
int _case=1;
void _(){
    int n;cin>>n;
    string s,t;
    cin>>s>>t;
    int diff=0;
    for(int i=0;i<n;i++){
        diff+=(s[i]!=t[i]);
    }
    if(diff&1){
        reverse(all(s));

    }
    int cnt=0;
    for(int i=0;i<n;i++){
        cnt+=s[i]!=t[i];
    }
    cout<<cnt<<endl;
}

signed main(){
    boost;
    // file;
    int T=1;
    // cin>>T;
    while(T--){
        _();
        // _case++;
    }
}