## Description:

Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts at a point *N* (0 ≤ *N* ≤ 100,000) on a number line and the cow is at a point *K* (0 ≤ *K* ≤ 100,000) on the same number line. Farmer John has two modes of transportation: walking and teleporting.

* Walking: FJ can move from any point *X* to the points *X *- 1 or *X *+ 1 in a single minute

* Teleporting: FJ can move from any point *X* to the point 2 × *X* in a single minute.

If the cow, unaware of its pursuit, does not move at all, how long does it take for Farmer John to retrieve it?

## Input:

Line 1: Two space-separated integers:

*N* and

*K*
## Output:

Line 1: The least amount of time, in minutes, it takes for Farmer John to catch the fugitive cow.

## Sample Input:

5 17

## Sample Output:

4

## Note:

The fastest way for Farmer John to reach the fugitive cow is to move along the following path: 5-10-9-18-17, which takes 4 minutes.