enum Mark{ UNMARKED, PRIME, NOTPRIME};

public class Eratosthenes {
    public static int[] sieve( int n ) {
               int[] primes = new int[];
               Mark[] mark = new Mark[];

               mark[0] = Mark.NOTPRIME;
               mark[1] = Mark.NOTPRIME;

               for (int k = 2; k <= n; k++ ) {
                   mark[k] = Mark.UNMARKED;
               }

               for (int i = 2; i <= n; i++) {
                   for (int j = 2; j <= n / i; j++) {
                       int notprime = i * j;
                       mark[notprime] = Mark.NOTPRIME;

                     }
                }
                for (int l = 2; l <= n; l++) {
                   if ( mark[l] == Mark.UNMARKED) {
                       mark[l] = Mark.PRIME;
                        l = primes;


                   }
                }
                return primes;
    }
}