#include "stdafx.h"
int BitCounter(int a)
{
	int Counter=0;
	int CountTime=1;
	for(;a;a/=2){
		if(a&1){
			Counter++;
			CountTime++;
		}
		if(CountTime==12)
			break;
	}
	return Counter;
}
int main()
{
	int a;
	scanf("%d",&a);
	printf("%d",BitCounter(a));

	return 0;
}