#include<iostream>
#include<conio.h>
#include<stdlib.h>
#include<stdio.h>
using namespace std;
int main()
{ FILE *f;
  int a,b=0;
  f=fopen("data.txt","r");
  FILE *g;
  g=fopen("dataout.txt","w");
   if(f==NULL)
       printf("File opening error");
  fscanf(f,"%d",&a);
  while(a!=0)
   { b=b*10+a%2;
     a=a/2;
   }
  int sum=0;
  while(b!=0)
  { sum=sum+b%10;
    b=b/10;
  }
  fprintf(g,"%d",sum);
  return 0;
}