SetBits.java

import java.util.*;

public class SetBits {
    public static void main (String[] args) {
        Scanner input = new Scanner(System.in);

        int num = input.nextInt();
        int setBits;
        setBits = countSetBits(num);
        System.out.println(setBits);
    }

    public static int countSetBits(int n){
        int count=0;
        while(n!=0){
            n = n&(n-1);
            count++;
        }
        return count;
    }
}