using System;

public class Program {
	public static void Main(string[] args) {
		int[] maxDay = {31,28,31,30,31,30,31,31,30,31,30,31};
		int count = 0;
		for (int m = 1; m <= 12; m++) {
			for (int d = 1; d <= maxDay[m-1]; d++) {
				if (m == d / 10 + d % 10) {
					count++;
				}
			}
		}
		Console.WriteLine(count);
	}
}