type ABC(stream:System.IO.TextReader) =
  member this.Scan1 f = stream.ReadLine() |> f
  member this.Scan2 f = stream.ReadLine().Split() |> Array.map f |> (fun a -> (a.[0], a.[1]))
  member this.Scan3 f = stream.ReadLine().Split() |> Array.map f |> (fun a -> (a.[0], a.[1], a.[2]))
  member this.Scan4 f = stream.ReadLine().Split() |> Array.map f |> (fun a -> (a.[0], a.[1], a.[2], a.[3]))
  member this.ScanVecH f = stream.ReadLine().Split() |> Array.map f
  member this.ScanVecV n f = [| for i in 1..n -> stream.ReadLine() |> f |]
  member this.ScanMatrix n f  = [ for i in 1..n do yield stream.ReadLine().Split() |> Array.map f ]
  member this.ScanCharMatrix n = [| for i in 1..n -> stream.ReadLine().ToCharArray() |]
  member this.Close () = stream.Close()

let util = ABC(stdin)

let N,M,C = util.Scan3 int
let As = util.ScanVecH int
let Bs = util.ScanMatrix N int

let isOK arr =
  Array.map2 (*) As arr
  |> Array.sum
  |> fun x -> (x + C) > 0

Bs
|> List.filter isOK
|> List.length
|> printfn "%d"

