How many Fibs

http://acm.hust.edu.cn/vjudge/contest/view.action?cid=30506#problem/P

import java.util.*;import java.math.*;public class Main {public static void main(String args[]){Scanner cin=new Scanner(System.in);BigInteger f[]=new BigInteger[1000];BigInteger a,b;int i,ans;f[1]=BigInteger.ONE;f[2]=BigInteger.valueOf(2);for(i=3;i<1000;i++)f[i]=f[i-1].add(f[i-2]);while(true){a=cin.nextBigInteger();b=cin.nextBigInteger();if(a.compareTo(b)>0){System.out.println(0);continue;}if(a.compareTo(BigInteger.ZERO)==0&&b.compareTo(BigInteger.ZERO)==0)break;ans=0;for(i=1;i<1000;i++){if(f[i].compareTo(a)>=0&&f[i].compareTo(b)<=0)ans=ans+1;}System.out.println(ans);}}}