program C;

{$APPTYPE CONSOLE}

uses
  SysUtils;

const
  fin='C.txt';
  fout='pair.txt';

var
  fi,fo:text;
  n,i,j, count:integer;

begin
  assign(fi,fin);
  reset(fi);
  read(fi,n);
  close(fi);
  count:=0;
  for i:=1 to n do
   for j:=1 to n do
     if (j mod i = 0) then count:=count+1;
  assign(fo,fout);
  rewrite(fo);
  write(fo,count);
  close(fo);
end.