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 {
         BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
            double t=Double.parseDouble(reader.readLine());
            double current;
            if (t>5) {
                if (t%5==0) {
                    current=5;
                }
                else {
                    current=t%5;
                }
            }
            else {
                current=t;
            }
            if (current>=1 & current <4) {
                System.out.println("зелёный");
            }
            else if (current>=4 & current <5) {
                System.out.println("жёлтый");
            }
            else if (current>=5 | current <1) {
                System.out.println("красный");
            }
}
}