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


public class Main_yukicoder188 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        Calendar c = new GregorianCalendar(2015, 0, 1);
        
        int happy = 0;
        while (c.get(Calendar.YEAR) < 2016) {
        	int m = c.get(Calendar.MONTH) + 1;
        	int d = c.get(Calendar.DAY_OF_MONTH);
        	if (m == d % 10 + d / 10) {
        		happy++;
        	}

//        	int y = c.get(Calendar.YEAR);
//    		System.out.println(y + "/" + m + "/" + d);
        	c.add(Calendar.DAY_OF_YEAR, 1);
        }
        
        System.out.println(happy);
        
        sc.close();
    }
}