let ``No.275 中央値を求めよ``() =

  stdin.ReadLine();
  stdin.ReadLine().Split(' ')
  |> Array.map (fun s -> s |> int)
  |> Array.sort
  |> fun l -> 
    match (l.Length % 2) with
    | 0 -> (float(l.[l.Length/2-1] ) + float(l.[l.Length/2])) / 2.
    | _ -> float (l.[ l.Length / 2 ])
  |> stdout.WriteLine

``No.275 中央値を求めよ``()