let rec cookie n cok keep i =
  if cok >= n then i
  else
    let cok2 = cok * 2 in
    if cok2 > n then cookie n (cok - 1) (keep + 1) i
    else cookie n (keep + cok2) 0 (i+1)

let () =
  print_int @@ (Scanf.sscanf (read_line ()) "%d" cookie) 1 0 0