def collatz(number):
    counter = 0
    while number != 1:
        counter = counter + 1
        if (number%2==0):
            number = (number//2)
            print (str(number) + ' ' ,end='')
        else:
            number = (3 * number + 1)
            print (str(number) + ' ' ,end='')
    print()
    print()
    print('Number of calls: '+ str(counter))

def ask():
    print('Your Number? :', end='')
    global number
    try:
        number = int(input())
        print()
    except ValueError:
        print('Please enter an integer.')
        print()
        ask()

ask()
collatz(number)