1 def pilabin(i):
   2     l=[]
   3     while i >= 2:
   4         if i%2==0:
   5             l.append(str(0))
   6         else:
   7             l.append(str(1))
   8         i=i/2
   9     l.append(str(i))
  10     b=''.join(l[::-1])
  11     return b