open System open System.Collections.Generic [] module Cin = let read f = stdin.ReadLine() |> f let reada f = stdin.ReadLine().Split() |> Array.map f let readChars() = read string |> Seq.toArray let readInts() = readChars() |> Array.map (fun x -> Convert.ToInt32(x.ToString())) [] module Cout = let writer = new IO.StreamWriter(new IO.BufferedStream(Console.OpenStandardOutput())) let print (s: string) = writer.Write s let println (s: string) = writer.WriteLine s let inline puts (s: ^a) = string s |> println let solve() = let x = read int64 let y = read int64 let t = read int64 let mutable ans = match y,x with | _ when y >= 0L && x > 0L -> 1L | _ when y >= 0L && x = 0L -> 0L | _ when y >= 0L && x < 0L -> 1L | _ -> 2L let y = abs y let x = abs x ans <- ans + (x / t) + (x % t) ans <- ans + (y / t) + (y % t) puts ans () [] let main _ = try solve() with e -> printfn "%s" (e.ToString()) writer.Close() 0 // return an integer exit code