let () =
  Scanf.scanf "%d %d\n" @@ fun n d ->
  let arr = Array.of_list
      (0 :: (Array.to_list (Array.init (n-1) @@ fun _ -> Scanf.scanf "%d " @@ fun d -> d))) in
  for i = 0 to n - 2 do
    if arr.(i+1) - arr.(i) >= d then ()
    else arr.(i+1) <- arr.(i) + d
  done;
  Array.iter (fun x -> print_int x; print_string " ") arr;
  print_newline ()