import java.util.*;
public class Main {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
while (sc.hasNextInt()) {
int n = sc.nextInt();
String s = trans(n, 2);
int yi = 0;
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == '1') {
yi++;
}
}
System.out.println(yi);
}
}
public static String trans(int num, int radix)
{
if(radix == 2)
return Integer.toBinaryString(num);
else if(radix == 8)
return Integer.toOctalString(num);
else if(radix == 16)
return Integer.toHexString(num);
return null;
}
}