#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; }