1 a = int( raw_input( 'Enter number: ') )

     1 num = int( raw_input( 'Enter number: ') )

     2 while a != 4:

     2 while num != 4:

     3     print a,

     3     print num,

     4     if a % 2 == 1:

     4     if num % 2 == 1:

     5         a = a * 3 + 1

     5         num = num * 3 + 1

     7         a /= 2

     7         num /= 2