#include <stdio.h>
long main()
{
    FILE *fin,*fout;
    fin=fopen("bitcount.in","r");
    fout=fopen("bitcount.out","w");
    int n;
    int x=0;
    fscanf(fin,"%d",&n);
    while(n)
    {
        x=x+n%2;
        n=n/2;
    }
    fprintf(fout,"%d",x);
    return 0;
}