fun getMoneySpent(keyboards: Array<Int>, drives: Array<Int>, b: Int): Int {
    var max=0
    for(k in 0 until keyboards.size){
        for(d in 0 until drives.size){
            var sum=keyboards[k]+drives[d]
            if(sum>max && b>=sum){
                max=sum
            }
        }
    }
    return if(max==0) -1 else max
}