Problem Statement

Nukes has an integer that can be represented as the bitwise OR of one or more integers between $A$ and $B$ (inclusive). How many possible candidates of the value of Nukes's integer there are?

Constraints

• $1 ≤ A ≤ B < 2^{60}$
• $A$ and $B$ are integers.

Input

The input is given from Standard Input in the following format:

A
B

Output

Print the number of possible candidates of the value of Nukes's integer.