fun main(args:Array<String>) {
    val turnCount = readLine()!!.toInt()
    val cards1 = readLine()!!.split(" ").map { it.toInt() }
    val cards2 = readLine()!!.split(" ").map { it.toInt() }

    val ans = getResult(cards1, cards2, 0, turnCount).let { it.first / it.second.toDouble() }
    println(ans)

}



fun getResult(myCards:List<Int>, otherCards:List<Int>, subTotal:Int, turnCount:Int):Pair<Int, Int> {
    if(myCards.size == 0) {
        return if(subTotal > (turnCount - subTotal)) 1 to 1 else 0 to 1
    }

    var winCount = 0 to 0

    for(i in myCards.indices) {
        val newMyCards = myCards.withIndex().filter { it.index != i }.map { it.value }
        for(j in otherCards.indices) {
            val newOtherCards = otherCards.withIndex().filter { it.index != j }.map { it.value }
            val ret = getResult(newMyCards, newOtherCards, if (myCards[i] > otherCards[j]) subTotal + 1 else subTotal, turnCount)
            winCount = winCount.first + ret.first to winCount.second + ret.second
        }
    }
    return winCount
}