#include "ancient2.h"
#include <bits/stdc++.h>
using namespace std;
const int M = 1000;
string Solve(int N) {
const int len = 108;
return "";
}
/*
namespace {
using std::exit;
using std::fprintf;
using std::printf;
using std::scanf;
constexpr int N_MAX = 1'000;
constexpr int M_MAX = 1'002;
constexpr int Q_MAX = 1'000;
int N;
char S[N_MAX + 1];
int query_count = 0;
int query_m_max = 0;
void WrongAnswer(int code) {
printf("Wrong Answer [%d]\n", code);
exit(0);
}
} // namespace
int Query(int m, std::vector<int> a, std::vector<int> b) {
if (++query_count > Q_MAX) WrongAnswer(7);
if (!(1 <= m && m <= M_MAX)) WrongAnswer(4);
if ((int)a.size() != m || (int)b.size() != m) WrongAnswer(5);
for (int i = 0; i < m; i++) {
if (!(0 <= a[i] && a[i] <= m - 1) || !(0 <= b[i] && b[i] <= m - 1))
WrongAnswer(6);
}
if (m > query_m_max) query_m_max = m;
int memory = 0;
for (int i = 0; i < N; i++) {
if (S[i] == '0') {
memory = a[memory];
}
if (S[i] == '1') {
memory = b[memory];
}
}
return memory;
}
int main() {
if (scanf("%d", &N) != 1) {
fprintf(stderr, "Error while reading input.\n");
exit(1);
}
if (scanf("%s", S) != 1) {
fprintf(stderr, "Error while reading input.\n");
exit(1);
}
std::string s = Solve(N);
if ((int)s.size() != N) WrongAnswer(1);
for (int i = 0; i < N; i++) {
if (!(s[i] == '0' || s[i] == '1')) WrongAnswer(2);
}
for (int i = 0; i < N; i++) {
if (s[i] != S[i]) WrongAnswer(3);
}
printf("Accepted: %d\n", query_m_max);
return 0;
}
//*/
