#include <iostream> using std::cin; using std::cout; const char endl = '\n'; const int N = 2e5 + 5; int n, a[N], b[N], s1[N], s2[N], ans; int main() { std::ios::sync_with_stdio(false); cin.tie(nullptr); cin >> n; for (int i = 1; i <= n; i++) { cin >> a[i]; } for (int i = 1; i <= n; i++) { cin >> b[i]; } for (int i = 1; i <= n; i++) { s1[i] = s1[i - 1] + (a[i] == b[i]); s2[i] = s2[i - 1] + (a[i] == b[i - 1]); } ans = s2[n]; for (int i = 1; i <= n; i++) { ans = std::max(ans, s1[i - 1] + s2[n] - s2[i] + (a[i] == b[n])); } cout << ans << endl; return 0; }