import java.util.Calendar;
 
class Main {
	public static void main(String[] args){
		Calendar calender = Calendar.getInstance();
		int ans = 0;
		calender.set(2015, 0, 1);
		while(calender.get(Calendar.YEAR) == 2015){
			if(calender.get(Calendar.MONTH) + 1 == (calender.get(Calendar.DATE) / 10 + calender.get(Calendar.DATE) % 10)){
				ans++;
			}
			calender.add(Calendar.DAY_OF_MONTH, 1);
		}
		System.out.println(ans);
	}
}