#2577. Naughty fairies

题目描述

给你一个正整数A,B(a,b<=10^500).要你通过以下三种操作将A变成B。操作分别是
a=a+1
a=a-1
a=2*a
输出最小需要的操作次数

输入格式

There are several test cases, ended by "0 0".
For each test case, there are only one line containing two numbers separated by a blank, N and M, the original numbers of peaches and the numbers of peaches left(0<N,M<10^500).There is no leading zero.

输出格式

For each test case, you should output just a number K indicating the minimum time (in minutes) Lily needed to finish her illusion magic.

样例

样例输入

5 2  

1 99  

86 32  

0 0

样例输出

2  

98  

12

数据范围与提示