public class Collatz {
    public static void main(String[] args) {
        System.out.println(collatz(0, 17));
    }

    public static int collatz(int count, int num){
        if(num == 1)    return count;
        else if(num % 2 == 0)   return collatz(count+1, num/2);
        else    return collatz(count+1, (num*3)+1);
    }
}