There are three poles A, B, and C. There are N (N>1) perforated disks on pole A, and the size of the disks decreases from bottom to top. All disks must be moved to pole C according to the following rules: Only one disk can be moved at a time; A large disk cannot be stacked on a small disk. Tip: You can temporarily place the disk on pole B, or move the disk removed from pole A back to pole A, but both rules must be followed. The times varible is how many times you need to move.
