#include<bits/stdc++.h>
#include<atcoder/all>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
#include<math.h>
#include<set>
#include<regex>
#include<deque>
#include<queue>
#define all(x) x.begin(),x.end()
#define gall(x) x.begin(),x.end(),greater<>()
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define pb push_back
#define ll long long 
#define P pair<int,int>
#define LP pair<ll,ll>
using namespace std;
using namespace atcoder;


int main(){
int n; cin>>n;
string s,t; cin>>s>>t;
int cnt1=0,cnt2=0,ans=0;
rep(i,n){
   if(s[i]=='1') cnt1++;
   if(t[i]=='1') cnt2++;
}
if(cnt1%2!=cnt2%2) reverse(all(t));
rep(i,n){
   if(s[i]!=t[i])ans++;
}
cout<<ans<<endl;
return 0;
}