Follow up: A fun way to multiply numbers

Here's python code to multiply numbers as mentioned in the A fun way to multiply numbers blog entry.

NOTE: I am not a python expert, so there could be some obvious bugs in this simple piece of code. As always use at your own risk.

print "Input the first number"
a=input()
print "Input the next number to be multiplied with %d" %a
b=input()
res=0
while a:
  if a & 0x1:
      res = res + b
  a = a >> 1
  b = b << 1

print "The result is %d\n" %res