Itsy Bits

On most modern computers, unsigned numbers are stored in memory-aligned chunks of data, made up
of bits. Depending on the size, one storage unit may be called a word, a byte,
or even a nybble.

Each kind of storage takes exactly  bits of data, for some non-negative integer . The smallest
unsigned number that can be stored in a -bit word is , and the largest is .

We are designing the storage for an embedded system where the maximum possible number in storage
will be known upfront. Calculate the number of bits we should dedicate to it.

Input
  itemize
    One line containing the largest number we need to store, , ().
  itemize

Output
  Output the number of bits we need to allocate to store , which should be a power of two,
  followed by either " bit" or " bits" as appropriate.