Scanf.scanf "%d %d" (fun n d ->
    let x = Array.init n (fun _ -> Scanf.scanf " %d" (fun x -> x)) in
    let v = Array.init n (fun _ -> Scanf.scanf " %d" (fun v -> v)) in
    let vs = Array.fold_left (+) 0 v in

    Printf.printf "%d\n" @@ (d + vs - 1) / vs
)