java - TLE for WILLITST (SPOJ) -

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i've written code in java below question, , getting correct answer on machine. when submit on spoj, giving tle (time limit exceeded) error. can please me in correcting / improvising this?

[question]: http://www.spoj.com/problems/willitst/

here code tried:

import java.io.bufferedreader; import java.io.inputstreamreader; import java.math.biginteger; import java.util.arraylist; class willitst {     public static void main(string[] args) throws exception {         bufferedreader br=new bufferedreader(new inputstreamreader(system.in));         biginteger n=biginteger.valueof(long.parselong(br.readline()));         arraylist<biginteger> al=new arraylist<biginteger>();         biginteger x=biginteger.valueof(2);         biginteger y=biginteger.valueof(3);          while(n.compareto(biginteger.one)==1){             al.add(n);             if(n.mod(x) == biginteger.zero)                 n=n.divide(x);             else n=y.multiply(n).add(y);             if(al.contains(n))             {                 system.out.println("nie");                 return;             }         }         system.out.println("tak");     } }

thanks in advance.

submitted below code successfully, w/o tle: 

import java.io.bufferedreader; import java.io.inputstreamreader; import java.math.biginteger; import java.util.hashset; import java.util.set; class willitst_biginteger {     public static void main(string[] args) throws exception {         bufferedreader br=new bufferedreader(new inputstreamreader(system.in));         biginteger n=biginteger.valueof(long.parselong(br.readline()));         set<biginteger> s=new hashset<biginteger>();         biginteger x=biginteger.valueof(2);         biginteger y=biginteger.valueof(3);         while(n.compareto(biginteger.one)==1){             if(!s.add(n)){                 system.out.println("nie");                 return;             }             if((n.and(n.subtract(biginteger.one))).equals(biginteger.zero)){                 system.out.println("tak");                 return;             }             if((n.and(biginteger.one)).equals(biginteger.zero))                 n=n.divide(x);             else n=y.multiply(n).add(y);         }         system.out.println("tak");     } }

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