import java.util.ArrayList;

public class Box {
	private ArrayList<Box>	internalBoxes;

	// A constructor that makes a box with no boxes in it
	public Box() {
		internalBoxes = new ArrayList<Box>();
	}

	// Get method
	public ArrayList<Box> getInternalBoxes() { return internalBoxes; }

	// Method to add a box to the internal boxes
	public void addBox(Box b) {
		internalBoxes.add(b);
	}
	// Method to remove a box from the internal boxes
	public void removeBox(Box b) {
		internalBoxes.remove(b);
	}

	// Unwrap  the box and return the number of boxes altogether (including this one)
	public int unwrap() {
		if (internalBoxes.size() == 0)
			return 1;
		// Count this box
		int count = 1;

		// Count each of the inner boxes
		for (Box b: internalBoxes)
			count = count + b.unwrap();
		return count;
	}

	// Unwrap  the box and return the number of boxes altogether (including this one)
	public int unwrap2() {
		if (internalBoxes.size() == 0)
			return 1;

		// Remove one internal box, if there is one
		Box  insideBox = internalBoxes.remove(0);

		// Unwrap the rest of this box as well as the one just removed
		return this.unwrap2() + insideBox.unwrap2();
	}

	// Unwrap  the box and return the number of boxes altogether (including this one)
	public int unwrap3() {
		if (internalBoxes.size() == 0)
			return 1;
		// Remove one internal box, if there is one
		Box  insideBox = internalBoxes.remove(0);

		// Unwrap the rest of this box as well as the one just removed
		int result = this.unwrap3() + insideBox.unwrap3();

		// Put the box back in at position 0 (i.e., same order)
		internalBoxes.add(0,insideBox);

		return result;
	}

}