n = int(input())

if n == 1:
  print(0)
  exit()

cnt = 0
while True:
  d, m = divmod(n, 2)
  n = d
  # print(f"{n = }, { m = }")
  if n == 1 and m == 0:
    pass
  else:
    cnt += 1
  if n == 0:
    break

print(cnt)