#include #include using namespace std; using namespace atcoder; typedef int64_t lint; #define rep(i, n) for(int i=0; i; using vvi = vector>; template inline void vin(vector& v) { rep(i, v.size()) cin >> v.at(i); } template inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } template inline void drop(T x) { cout << x << endl; exit(0); } template void vout(vector v) { rep(i, v.size()) { cout << v.at(i) << ' '; } cout << endl; } constexpr lint LINF = LLONG_MAX/2; int main() { lint N; string S, T; cin >> N >> S >> T; lint a=0, b=0, c=0, x, y, z; rep(i, N) { if (S[i] != T[i]) a++; } if (a%2) a++; reverse(all(S)); rep(i, N) { if (S[i] != T[i]) b++; } if (!b%2) b++; cout << min(a, b) << endl; }