let waketime n h m t =
  let minute_to_hour m =
    (m / 60) mod 24
  in
  let rec wakeminutes n' m' =
    if n' = 1 then
      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)