#include "../../include/aoc.hpp"
#include <bits/stdc++.h>
using namespace std;

vector<int> tape;

// HACK: hardcoded input
ll rec(int i, ll a) {
	for (ll aa = a << 3; aa < (a + 1) << 3; aa++) {
		ll b = aa & 7;
		b ^= 1;
		ll c = aa >> b;
		b ^= c ^ 4;
		if ((b & 7) == tape[i]) {
			if (i == 0) {
				return aa;
			} else {
				ll n = rec(i - 1, aa);
				if (n != -1) {
					return n;
				}
			}
		}
	}
	return -1;
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	int n;
	cin.ignore(12);
	cin >> n;
	cin.ignore(13);
	cin >> n;
	cin.ignore(13);
	cin >> n;
	cin.ignore(11);
	while (cin >> n) {
		tape.push_back(n);
		cin.ignore();
	}

	cout << rec(tape.size() - 1, 0) << '\n';
}