package test1;

public class Answer {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		int count_happyday = 0;
		for(int month=1; month<13; month++){

			//28日までの計算
			for(int day10=1; day10<=2; day10++){
				for(int day1=1; day1<=9; day1++){
					if(month == day10 + day1){
						count_happyday++;
					}
				}
			}
		}
			System.out.print(count_happyday+2);
	}
}