let solve n =
  let rec inner n acc =
    if n = 0 then acc
    else 
      if n mod 15 = 0 then inner (n-1) (acc+4)
      else if n mod 3 = 0 || n mod 5 = 0 then inner (n-1) (acc+2)
      else inner (n-1) acc
  in 
  print_int @@ inner n 0

let _ =
  let n = int_of_string @@ read_line() in
  solve n