let minute_to_hour m =
  (m / 60) mod 24

let waketime n h m t =
  let rec wakeminutes n' m' =
    if n' = 1 then (* 0ではない *)
      let hour = minute_to_hour m' in
      let minute = m' mod 60 in
      Printf.printf "%d\n%d\n" hour minute
    else
      wakeminutes (n'- 1) (m' + t)
  in
  wakeminutes n (h * 60 + m)

let exe () =
  print_endline "\nInput values.";
  print_endline " nidone times = ?";
  let n = int_of_string (read_line ()) in
  print_endline " alarm rings at (hour) = ?";
  let h = int_of_string (read_line ()) in
  print_endline " alarm rings at (minute) = ?";
  let m = int_of_string (read_line ()) in
  print_endline " alarm ringing interval (minute) = ?";
  let t = int_of_string (read_line ()) in
  waketime n h m t

let rec try_exe () = try exe () with Failure "int_of_string" -> print_newline ();
								try_exe ()

let () = try_exe ()