using System;

namespace ConsoleApplication2

{

class class1

{

enum marks { verybad, bad, avg, good, verygood };

public static void Main()

{

marks priority = marks.verybad;

string mark = Console.ReadLine();

if (Convert.ToInt32(mark) < 30)

{

priority = marks.verybad;

}

if (Convert.ToInt32(mark )>= 30 && Convert.ToInt32(mark) < 50)

{

priority = marks.bad;

}

if (Convert.ToInt32(mark )>= 50 && Convert.ToInt32(mark) < 75)

{

priority = marks.avg;

}

if (Convert.ToInt32(mark) >= 75 && Convert.ToInt32(mark) < 90)

{

priority = marks.good;

}

if (Convert.ToInt32(mark) >= 90)

{

priority = marks.verygood;

}

Console.WriteLine(IsImportant(priority));

Console.ReadLine();

}

static string IsImportant(marks priority)

{

switch (priority)

{

case marks.verybad:

return "varybad";

case marks.bad:

return "bad";

case marks.avg:

return "avg";

case marks.good:

return "good";

case marks.verygood:

return "verygood";

default:

return "xxxxxxxxxx";

}

}

}

}