#include <stdio.h>
int main()
{
    int n;
    int pow[6]={1,2,4,8,16,32};
    scanf("%d",&n);
    int counter=0;
    for(int i=0;i<6;i++)
    {
        if((n&pow[i])==1) counter++;
    }
    printf("%d\n",counter);
}