using System;
class Program {
    static void Main(string[] args) {
        //月と日数の配列の定義
        int[] months = new int[12] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
        int[] days = new int[12] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

        //HappyDayの数
        int happyDays = 0;

        //判定
        for (int m = 0; m < months.Length; m++) {
            for (int d = 1; d <= days[m]; d++) {
                if (months[m] == d / 10 + d % 10) {
                    happyDays++;
                }
            }
        }

        //出力
        Console.WriteLine(happyDays);
    }
}