package com.codegym.task.task04.task0416;

/*
Crossing the road blindly

*/

import java.io.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        //write your code here
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String input = reader.readLine();
        double t = Double.parseDouble(input);

        if (t%4 == 0) {
            System.out.print("red");
        } else if (((t % 4) >= 3.00) && ((t % 4) <= 3.99)) {
            System.out.print("yellow");
        } else {
            System.out.print("green");
        }
    }
}