import java.util.Scanner;
import java.util.Calendar;
 
public class Main {
    public static void main(String[] args) throws Exception {
        Calendar cl = Calendar.getInstance();
        int y = 2015;
        int m = 1;
        cl.set(y,m-1,1);
        int count = 0;
        for(m=1;m<=12;m++){
        	cl.set(y,m-1,1);
        	int d = cl.getActualMaximum(Calendar.DAY_OF_MONTH);
        	for(int x= 1;x<=d;x++){
        		int tens = x / 10; 
        		int ones = x % 10;
        		if(m==tens+ones){
        		  count +=1;
        		}
        	}
        }
        System.out.println(count);
    }
}