public enum Engines
{
    TwoEngines(1),
    FourEngines(2),
    SixEngines(6);

    Engines(int i) {

    }

    public static Engines GetNumEngines(int i)
    {
        switch(i)
        {
            case 1:
                return TwoEngines;
            case 2:
                return  FourEngines;
            case 3:
                return SixEngines;
        }
        return null;
    }
}