public class bitarrayisParm {
    public boolean isParm(int num) {
        int n = num;
        int sum = 0;
        while(n > 0) {

            sum = (sum * 2 + (n & 1));
            n >>= 1;
            //System.out.printf("sum %d,n %d\n",sum,n);
        }
        return sum == num;
    }
}