#include <iostream>
#include <string.h>

using namespace std ;

long count_bits(long n) {
  unsigned int c;
  for (c = 0; n; c++)
    n &= n - 1;
  return c;
}

int main()
{
    int N ;
    cin >> N ;
    cout << count_bits(N);
    return 0 ;


}