import java.util.Calendar;

public class CalendarTest {
private static int count=0;
	public static void main(String[] args) {
		for(int i=0; i<12; i++){
			Calendar theDay = Calendar.getInstance();
			theDay.set(2015, i,1);
			int maxDate = theDay.getActualMaximum(Calendar.DATE);
			check(i,maxDate);
		}
		System.out.println(count);
	}
	private static int check(int month, int lastday){
		int OneDigit = 0;
		int TwoDigit = 0;
		for(int i=1;i<=lastday;i++){
			OneDigit = i % 10;
			TwoDigit = i / 10;
			if ( month + 1 == OneDigit + TwoDigit){
				count++;
			}
		}
		return 1;
	}
}