import java.util.Calendar;

class Wandbox
{
    public static void main(String[] args)
    {
        Calendar calendar = Calendar.getInstance();
        
        calendar.set(2015, 0, 1);
        int cnt = 0;
        
        while(calendar.get(calendar.YEAR) == 2015) {
			
        	if(calendar.get(calendar.YEAR) != 2015) {
        		break;
        	} 
        		
        	int mon = calendar.get(calendar.MONTH) + 1;
        	int day = calendar.get(calendar.DATE);
        	if(mon == day / 10 + day % 10) {
        		cnt++;
        	}
        	
			calendar.add(Calendar.DATE, 1);
			
        }
        
        
        
        System.out.println(cnt);
        
    }
}