How can this exercise be solved if and while

I have this h/w for exams and not working. I have install pycharm but i testing online. The h/w say x=15 and y=35. Exercise says: What will be the final values of the variables when this exercise is performed. If users give us from Pc x = 15 and y = 35?

My test but not work is : z= y//2 i tryed x=raw_input() and x=input() but no. i tryed elif and else

And this is my code :

x=input()
y=input()
if x<y:
    z=x*2
else:
    z=y /2
    while z!=0:
 z=x%y
  print(z)
 x=y
 y=z
 print(x)