sealed class Plan : Parcelable {
        abstract val maxPlayer: Int

        @Parcelize
        class FREE(override val maxPlayer: Int = 10) : Plan()

        @Parcelize
        class SILVER(override val maxPlayer: Int = 15) : Plan()

        @Parcelize
        class GOLD(override val maxPlayer: Int = 20) : Plan()

        @Parcelize
        class UNKNOWN(override val maxPlayer: Int = 25) : Plan()

        override fun toString(): String {
            return when(this) {
                is FREE -> "free"
                is SILVER -> "silver"
                is GOLD -> "gold"
                is UNKNOWN -> "free"
            }
        }
    }