### ** pokenumbers**

In the Pokemon world, there are special numbers called Pokenumbers.
The Pokenumber of two integers x and y is the integer formed by interleaving the bits
of x and y in binary such that the bits of x are in the even position and the bits of y are in
the odd position.

In the problem, you will be given two integers x and y in base 10 (0 ≤ x, y ≤ 400 - 1) and
you should return the Pokenumber of x and y in base 10.

For example if x = 4 and y = 5,
then x = 0000000000000100 and y = 0000000000000101 in binary. Hence the Pokenumber of x and y is 00000000000000000000000000110001 in binary which is
equivalent to 49.

**Input**

The input consists of the two integers, x and y, on the same line separated by whitespace.

**Output**

Output the Pokenumber of x and y.

**Sample Input**

4 5

**Sample Output**

49