@main
def happy_day(): Unit =
  var ans = 0
  val month: Array[Int] = Array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
  for
    i <- 1 to 12
    j <- 1 to month(i)
    if i == (j % 10 + j / 10)
  do
    ans += 1
  println(ans)