fun pickingNumbers(a: Array<Int>): Int {
    var max=0
    a.sort()
    for(i in 0 until a.size){
        var currentMax=0
        for(j in i+1 until a.size){
            val diff=Math.abs(a[i]-a[j])
            if(diff<=1){
                currentMax++
            }
        }
        if(currentMax>max) max=currentMax
    }
    return max+1

}