import java.util.Calendar;

public class No188 {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        Calendar end = Calendar.getInstance();
        cal.set(2015, 0, 1);
        end.set(2015, 11, 31);
        cal.set(Calendar.MILLISECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        int m, d10, d1, ans = 0;

        while(cal.compareTo(end) < 0){
            m = cal.get(Calendar.MONTH) + 1;
            d10 = cal.get(Calendar.DATE) / 10;
            d1 = cal.get(Calendar.DATE) % 10;
            if(m == d10 + d1){
                ans++;
            }
            cal.add(Calendar.DATE, 1);

        }

        System.out.println(ans);
    }
}