open System

[<AutoOpen>]
module Cin =
    let read f = stdin.ReadLine() |> f
    let reada f = stdin.ReadLine().Split() |> Array.map f

    let readInts() =
        read string
        |> Seq.toArray
        |> Array.map (fun x -> Convert.ToInt32(x.ToString()))

module Util =
    let strRev s =
        s
        |> Seq.rev
        |> Seq.map string
        |> String.concat ""

[<EntryPoint>]
let main _ =
    let [|X;Y;Z|] = reada int
    let nin = min X Y
    let nax = max X Y
    let rem = Z - (nax-nin)
    printfn "%d" (nax + rem / 2)
    0 // return an integer exit code