hdu 3278

#include <iostream>
#include <queue>
#include <stdio.h>
#include <string>
using namespace std;
int a,b,used[200020];
queue<int>q;
int ok(int n)
{ 
       if(n < 200000&&n >= 0&&used[n]==0)  return 1; 
              return 0;
              }
              
 void bfs()
{        int n;  
      while(!q.empty()) 
             { 
                    //      cout<<q.front()<<endl;  
                                  if(q.front() == b) return ; 
                                                 n = q.front() - 1; 
    if(ok(n)){used[n] = used[q.front()]+1;q.push(n);}     
               n = q.front() + 1;  
  if(ok(n)){used[n] = used[q.front()]+1;q.push(n);
  }                n = q.front()*2; 
                 if(ok(n)){used[n] = used[q.front()]+1;q.push(n);
                 }                q.pop();        
                 }
                 }
                 
                 int main()
                 {     
                    while(cin>>a>>b)   
                         {             
                            memset(used,0,sizeof(used));          
                                  q.push(a);                used[a] = 1;       
                                           bfs();           
                                                cout<<used[b]-1<<endl;        
                                                        while(!q.empty())       
                                                                 {              
                                                                           q.pop();      
                                                                                     }  
                                                                                       
                                                                                           }  
                                                                                                 return 0;      
                                                                                                          }