fn main() {
  let mut count = 0;

  for t in 0..4 {
    for o in 0..10 {
      let d = t * 10 + o;
      if d > 30 {
        continue;
      }

      let h = o + t;
      if h >= 1 && h <= 12 {
        count += 1;
      }
    }
  }

  println!("{}", count);
}