let ``No.48 ロボットの操縦``() =

  let X = stdin.ReadLine() |> int
  let Y = stdin.ReadLine() |> int
  let L = stdin.ReadLine() |> int

  let sum = 0
  let sum = if X < 0 then sum+1 else sum
  let sum = if Y < 0 then sum+1 else sum

  let sum = sum + abs(X / L) + if (X % L = 0) then 0 else 1
  let sum = sum + abs(Y / L) + if (Y % L = 0) then 0 else 1
  stdout.WriteLine sum

``No.48 ロボットの操縦``()