class HappyDay{
    public static void main(String args[]){
        int happyday = 0; //ハッピーディの日数
        int[] days = {31,28,31,30,31,30,31,31,30,31,30,31}; //各月の日数
        
        for(int i = 0; i < 12; i++){
            for(int j = 1; j <= days[i]; j++){
                if((i+1) == (j /10) + (j % 10)){
                    happyday++;
                }else{}
            }
        }
        System.out.println(happyday);
    }
}