// Towers.java

public class Towers {
    private static int moves = 0;

    public static void moveDisc(int num, int from_tower, int to_tower, int temp_tower) {
        if (num > 0) {
            moveDisc(num - 1, from_tower, temp_tower, to_tower);
            System.out.println("Move a disc from tower " + from_tower + " to " + to_tower);
            moves++;
            moveDisc(num - 1, temp_tower, to_tower, from_tower);
        }
    }

    public static void main(String[] args) {
        if (args.length != 1) {
            System.out.println("Please pass a number!");
            return;
        }

        int number = Integer.parseInt(args[0]);
        moveDisc(number, 1, 3, 2);
        System.out.println(moves + " moves were made!");
    }
}