using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ABC138A
{
	class Program
	{
		static void Main(string[] args)
		{
			int a, green;
			a = int.Parse(Console.ReadLine());

			if (a >= 3200)
				Console.WriteLine("green");
			else
				Console.WriteLine("red");
			Console.ReadKey();
		}
	}
}
