import java.time.LocalDate;

public class A000188 {
	public static void main(String[] args) {
		LocalDate ld = LocalDate.of(2015, 1, 1);
		int r = 0;
		for(;ld.getYear()==2015;ld=ld.plusDays(1)) {
			int m = ld.getMonthValue();
			int d = ld.getDayOfMonth();
			if(m==d/10+d%10)r++;
		}
		System.out.println(r);
	}
}