def move(src,dst):
	if (src==0 and dst==2) or (src==2 and dst==0):
		errorMsg("Sorry Dave, I cannot let you move disks between slots 0 and 2 directly. Use the intermediate slot in all moves.")
	else:
		entity.move(src,dst)
# BEGIN TEMPLATE
def linearTwinHanoi(height, src,mid,dst):	
	# Your code here
	# BEGIN SOLUTION
	gather(height-1,src,mid,dst);
	move(src,mid);
	moveDouble(height-1, dst, mid, src);
	move(dst,mid);
	moveDouble(height-1, src, mid, dst);
	move(mid, src);
	moveDouble(height-1, dst, mid, src);
	move(mid, dst);
	scatter(height-1, src, mid, dst);
		
def gather(height, src, mid, dst):
	if (height >0):
		gather(height-1,src,mid,dst);
		move(src,mid);
		moveDouble(height-1, dst,mid,src);
		move(mid,dst);
		moveDouble(height-1, src, mid, dst);
def scatter(height, src, mid, dst):
	if (height>0):
		moveDouble(height-1, src, mid, dst);
		move(src,mid);
		moveDouble(height-1, dst, mid, src);
		move(mid,dst);
		scatter(height-1,src,mid,dst);
def moveDouble(height, src, mid, dst):
	if (height>0):
		moveDouble(height-1, src, mid, dst);
		move(src,mid);
		move(src,mid);
		moveDouble(height-1, dst, mid, src);
		move(mid,dst);
		move(mid,dst);
		moveDouble(height-1, src, mid, dst);
	# END SOLUTION
# END TEMPLATE
linearTwinHanoi(getSlotSize(getParam(0)), getParam(0),getParam(1),getParam(2))