#include<stdio.h>
#include<math.h>
int main(){
int n,c=0,s=0;
scanf("%d",&n);
//transformare in baza 2
while(n){
    if(n%2==1)
        s=s+pow(10,c);
    c++;
    n=n/2;
        }
c=0;
//se numara biti de 1
while(s)
{
    if(s%10==1)
        c++;
    s/=10;
}
printf("%d",c);
}