public class Solution {

    /*

     * @param num: An integer

     * @return: An integer

     */

    public int countOnes(int num) {

        // write your code here

        int count = 0;

        long temp = (long)num;

        if(temp < 0){

            temp = (long)Math.pow(2,32) + temp;

        }

        while(temp != 0){

            if(temp %2 == 1)

                count++;

            temp = temp / 2;

        }

        return count;

    }

};