package com.javarush.task.task04.task0416;
/*
Переходим дорогу вслепую
*/
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader br = new BufferedReader (new InputStreamReader(System.in));
String s = br.readLine();
String color;
double a = Double.parseDouble(s);
if (((a%5)<3)&((a%5)!=0))
color = "зеленый";
else {
if ((a%5)==3)
color = "желтый";
else
color = "красный";
}
System.out.println (color);
}
}