#include <iostream>
#include <cstdint>

using namespace std;

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

	uint32_t N;
	string S;
	cin >> N;
	S.reserve(N), cin >> S;

	if (S.find("404") == S.npos) cout << "NotFound\n";
	else cout << "Found\n";

	return 0;
}