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Public class Solution {
    public static void main(String[] args) throws Exception {
        //напишите тут ваш код
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String number = reader.readLine();
        double t = Double.parseDouble(number);

        if (t % 5 <= 3)
            System.out.println("зеленый");
        else
        if (t % 5 <= 4)
            System.out.println("желтый");
        else if (t % 5 != 0)
            System.out.println("красный");
    }
}