import java.util.ArrayList<Double>

class MySafeList extends ArrayList<Double>{

    ArrayList<Double> mySafeList;

    public void add(Double d){
        mySafeList.add(d);
    }

    public int size(){
        return mySafeList.size();
    }

    public double get(int i){
        mySafeList.get(i);
    }
}