#include <bits/stdc++.h>

using i64 = long long;

int main() {

    std::cin.tie(nullptr)->sync_with_stdio(false);

    int n;
    std::cin >> n;
    std::string s;
    std::cin >> s;

    std::cout << (s.find("404") != size_t(-1) ? "Found" : "NotFound") << '\n';

    return 0;
}