学步园

import java.math.BigInteger;
import java.util.Scanner;


public class hdu1316 {
	public static void main(String[] args)
	{
	 Scanner cin=new Scanner(System.in);
	 BigInteger arr[]=new BigInteger[600];
	 BigInteger a,b;int i;
	 arr[1]=BigInteger.valueOf(1);
	 arr[2]=BigInteger.valueOf(2);
	 for(i=3;i<600;i++)
	 arr[i]=arr[i-1].add(arr[i-2]);
	 while(cin.hasNextBigInteger())
	 {
	   a=cin.nextBigInteger();
	   b=cin.nextBigInteger();
	   if((a.compareTo(BigInteger.ZERO)==0)&&(b.compareTo(BigInteger.ZERO)==0))
		  break;
	  int count=0;
	  for(i=1;i<600;i++)
	  {
	  if(arr[i].compareTo(b)>0) break;
	  if(arr[i].compareTo(a)>=0&&arr[i].compareTo(b)<=0)
	  count++;
	  }
	  System.out.println(count);
	 }
	}

}