#include <bits/stdc++.h>

using i64 = long long;
using u64 = unsigned long long;
using u32 = unsigned;

using u128 = unsigned __int128;
using i128 = __int128;

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

    int n;
    std::cin >> n;

    std::string s;
    std::cin >> s;

    for (int i = 0; i < n - 2; i++) {
        if (s.substr(i, 3) == "404") {
            std::cout << "Found";
            return 0;
        }
    }
    std::cout << "NotFound";

    return 0;
}