#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <string>
#include <utility>
#include <tuple>
#include <set>
#include <map>
#include <cassert>

using namespace std;

int main() {
	int n;
	string s;
	cin >> n >> s;

	bool ok = s.find("404") != string::npos;
	cout << (ok ? "Found" : "NotFound") << endl;
	return 0;
}