open Printf
open Scanf

let input_int () =
  scanf "%d\n" (fun k -> k)

let g n =
  let m = int_of_float (sqrt (float_of_int n)) in
  let rec loop count k =
    if k>m then
      if m * m = n then
        2 * count - 1
      else
        2 * count
    else if n mod k = 0 then
      loop (count+1) (k+1)
    else
      loop count (k+1)
  in
  loop 0 1

let f () =
  let n = input_int () in
  let rec loop tot c =
    if c = n then
      tot
    else
      loop (tot + g (n - c)) (c+1)
  in
  loop 0 1

let () =
  let tot = f () in
  printf "%d\n" tot

