n = gets.to_i
#n = 10**(10**6)
cnt = 0;

tmp = 2**(5*10**3) - 1

def pop_count(x)
  ret = 0
  while x>0 do
    ret += 1
    x -= x&-x
  end
  return ret
end

while n>0 do
  if n&tmp > 0 then
    cnt += pop_count(n&tmp)
  end
  n >>= (5*10**3)
end

puts cnt