#include<stdio.h>
int count_one_bits(unsigned int value)
{
int count=0;
while(value)
{
if((value&1)==1)
count++;
value=value>>1;
}
return count;
}
int main()
{
unsigned int num=0;
scanf("%d",&num);
printf("%d\n",count_one_bits(num));
return 0;
}