#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

static T[] Range<T>(int n, Func<T> F) => Enumerable.Range(0, n).Select(_ => F()).ToArray();

var y = I<int>();
var n = I<int>();
var az = Range(n, I<int>);

var ans = "red";
var d = y - az.Sum();
if (d >= 0) ans = d.ToString();
Console.WriteLine(ans);