let ``No.311 z in FizzBuzzString``() =

  let (|Fizz|Buzz|FizzBuzz|Other|) arg =
    match (arg % 3m , arg % 5m ) with
    | 0m , 0m -> FizzBuzz
    | 0m , _ -> Fizz
    | _ , 0m -> Buzz
    | _ , _ -> Other

  stdin.ReadLine()
  |> decimal
  |> fun n ->
    [1m..n]
    |> List.sumBy (fun i ->
      match i with
      | FizzBuzz  -> 4
      | Fizz      -> 2
      | Buzz      -> 2
      | Other     -> 0
    )
    |> stdout.WriteLine    

``No.311 z in FizzBuzzString``()