let days = [|0; 31; 28; 31; 30; 31; 30; 31; 31; 30; 31; 30; 31|]

let solve n =
  let m = days.(n) in
  let rec doit i cnt =
    if i > m then cnt
    else
      let cnt = cnt + if i / 10 + i mod 10 = n then + 1 else 0 in
      doit (i + 1) cnt in
  doit 1 0

let () =
  let rec doit i acc =
    if i > 12 then acc
    else acc + solve i |> doit (i + 1) in
  doit 1 0 |> Printf.printf "%d\n"