public class HappyDay {
  public static void main(String[] args) {
    int count = 0;
    for (int x  = 1; x <= 12; x++) {
      for (int y10 = 0; y10 <= 2; y10++) { // 4月は30まで、31は比較不要
        for (int y1 = 0; y1 <= 9; y1++) {
          if (x == y10 + y1) {
            count++;
          }
        }
      }
    }
    count++; // 3/30
    System.out.println(count);
  }
}