import java.util.Scanner;


class BitCount {
    static Scanner console = new Scanner(System.in);

    public static void main(String[] args) {
        int input;
        int count = 0;

        input = console.nextInt();

        while(input!=0){
            if(input % 2 == 1){
                count++;
            }
            input /= 2;
        }
        System.out.println(count);
    }
}