import java.util.Scanner;
import java.util.Calendar;

class test{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        Calendar cl = Calendar.getInstance();
        cl.set(2014,12,31);
        int cnt = 0;
        for(int i=0;i<365;i++){
            cl.add(Calendar.DATE,1);
            int month = cl.get(Calendar.MONTH);
            if(month==0){
                month = 12;
            }
            int date = cl.get(Calendar.DATE);
            int dateSum = (date/10)+(date%10);
            if (month==dateSum){
                cnt++;
            }
        }
        System.out.println(cnt);
    }
}