import java.util.Scanner;

public class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (sc.hasNext())
{
String s = sc.nextLine();
String[]ss = s.split(",");

dfs(Integer.parseInt(ss[0]),Integer.parseInt(ss[1]),0 );
System.out.println(ans);}

}
static int ans = Integer.MAX_VALUE;
static void dfs(int a,int b,int curstep)
{
if(ans <= curstep)return;
if(a == b)
{
ans = Math.min(ans,curstep);
return;
}
if(a > b)
dfs(a-1,b,curstep+1);
else if(a < b)
{
if(a > 0)
{
dfs(2*a,b,curstep+1);
}
dfs(a+1,b,curstep+1);
}
}
}