#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n, s = 0;

    scanf("%d", &n);
    while (n != 0)
    {
        if ((n%2)!=0)
        {
            s += 1;
        }
        n /= 2;
    }
    printf("%d", s);
    return 0;
}