#include <stdio.h>

void main()
{
	int n, k = 0;
	
	scanf_s("%d", &n);
	while (n)
	{
		if (n & 1)

		{
			k++;
			n = n >> 1;
		}
		else
		n = n >> 1;
	}
	
	printf_s("%d", k);
}