import java.util.Calendar;

class test{
    public static void main(String[] args){
        Calendar cl = Calendar.getInstance();
        cl.set(2015,0,1);
        int cnt = 0;
        for(int i=0;i<365;i++){
            int month = cl.get(Calendar.MONTH)+1;
            int date = cl.get(Calendar.DAY_OF_MONTH);
            int dateSum = ((int)Math.floor(date/10))+(date%10);
            if (month==dateSum){
                cnt++;
            }
            cl.add(Calendar.DAY_OF_MONTH,1);
        }
        System.out.println(cnt);
    }
}