package com.javarush.task.task04.task0416;

/*
Переходим дорогу вслепую
*/

import java.io.*;
import java.util.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        //InputStream inputStream = System.in;
        //InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
        //BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        BufferedReader bufferedReader1 = new BufferedReader(new InputStreamReader(System.in));

        double a = Double.parseDouble(bufferedReader1.readLine());
        if (a == 0) System.out.println("Eror");
        else if (a % 5 <= 3) System.out.println("\"зеленый\"");
        else if (a % 5 >= 5) System.out.println("\"красный\"");
        else if (a > 60) System.out.println("Eror");
        else System.out.println("\"желтый\"");
    }
}