import java.io.*; import java.util.Scanner; public class Solution { public static void main(String[] args) throws Exception { Scanner sc1 = new Scanner(System.in); double t = sc1.nextInt(); if (t >= 0 && t < 3) { System.out.println("green"); } else if (t >= 3 && t < 4) { System.out.println("yellow"); } else { System.out.println("red"); } } }