import java.util.Scanner;

public class Main {
    public static boolean isHappyDay(int month, int day){
        if(day < 10 && month == day) return true;
        if(day >= 10 && (month == (day / 10) + (day % 10))) return true;
        return false;
    }
    
    public static void main(String []args){
        int ansCount = 0;
        for(int month = 1; month <= 12; month++){
            for(int day = 1; day <= 31; day++){
                if(month == 2 && day >= 29) continue;
                if(month == 4 && day >= 31) continue;
                if(month == 6 && day >= 31) continue;
                if(month == 9 && day >= 31) continue;
                if(month == 11 && day >= 31) continue;
                
                if(isHappyDay(month, day)){
                    ansCount++;
                }
            }
        }
        System.out.println(ansCount);
    }
}