import java.util.Calendar;

public class Main {

	public static void main(String[] args) {
		int count = 0;

		Calendar cal = Calendar.getInstance();

		for (int month = 0; month < 12; month++) {
			cal.set(2015, month, 1);

			for (int day = 0; day < cal.getActualMaximum(Calendar.DATE); day++) {
				count = (month == (day % 10) + (day / 10)) ? count + 1 : count;
			}
		}

		System.out.println(count);

	}

}