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