package com.codegym.task.task04.task0416;
/*
Crossing the road blindly
*/
package com.codegym.task.task04.task0416;
/*
Crossing the road blindly
*/
import java.io.*;
import java.util.Scanner;
public class Solution {
public static void main(String[] args) throws Exception {
//write your code here
Scanner sc = new Scanner(System.in);
double time = sc.nextDouble();
if((int)(time % 5) == 3){
System.out.println("yellow");
}else if((int)(time %5) == 4){
System.out.println("red");
}else {
System.out.println("green");
}
}
}