#include <bits/stdc++.h> using namespace std; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); int n; string s,t; cin >> n >> s >> t; string r = s; reverse(r.begin(),r.end()); int cnt1 = 0,cnt2 = 0; for(int i = 0; i < n; i++) { if(s[i] != t[i]) cnt1++; if(r[i] != t[i]) cnt2++; } if(cnt1%2 == 0) { cout << cnt1 << endl; } else { cout << cnt2 << endl; } }