import java.util.Calendar;
import java.util.GregorianCalendar;

public class Main {

    // 日(1~31)を分割して足した場合 29日 の 11 が最大値となる
    static final int SUM_OF_SPLIT_DAY_MAX = 11;

    public static void main(String[] args) {
        Calendar cal = GregorianCalendar.getInstance();
        cal.set(2015, 0, 1); // (1 月は 0)
        int happyDays = 0;
        int month = 1;
        int date = 1;
        int sumOfSplitDay;

        while (cal.get(Calendar.YEAR) == 2015) {
            month = cal.get(Calendar.MONTH) + 1;
            if (month > SUM_OF_SPLIT_DAY_MAX) {
                cal.add(Calendar.MONTH, 1);
                cal.set(Calendar.DATE, 1);
                break;
            }

            while (cal.get(Calendar.MONTH) + 1 == month) {
                date = cal.get(Calendar.DATE);

                //
                sumOfSplitDay = date / 10 + date % 10;
                if (month == sumOfSplitDay ) {
                    happyDays++;
//                    System.out.println(month + "/" + date);
                }

                cal.add(Calendar.DATE, 1);
            }
        }

        System.out.println(happyDays);
    }
}