using static System.Math;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = long.Parse(line[0]);
        var b = long.Parse(line[1]);
        var c = Gcd(a, b);
        Console.WriteLine(check(c) ? "Odd" : "Even");
    }
    static bool check(long a)
    {
        var t = (long)Sqrt(a);
        return t * t == a | (t + 1) * (t + 1) == a;
    }
    static long Gcd(long a, long b)
    {
        if (a < b) return Gcd(b, a);
        while (b != 0)
        {
            var w = a % b;
            a = b;
            b = w;
        }
        return a;
    }
}