A = [int(input())]
if A[0] == 1:
    print(0)
else:
    for i in range(0,400):
        if A[i] % 2 == 0:
            if A[i] // 2 == 1:
                print(i+1)
                break
            else:
                A.append(A[i] // 2)
        else:
            A.append(A[i] * 3 + 1)
print(max(A))