let ``No.485 方程式のお勉強``() =

  let (|NO|KaiX|) (a , b) = 
    if b % a = 0 then KaiX else NO

  stdin.ReadLine().Split(' ')
  |> fun args -> (args.[0] |>int, args.[1] |> int)
  |> fun (a,b) ->
    match (a,b) with
    | NO   -> "NO"
    | KaiX -> string(b / a)
  |> stdout.WriteLine
    
  ()
``No.485 方程式のお勉強``()