public class happyDay {

	public static void main(String[] args) {
		int i, j, s = 0;
		int[] d = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

		for (i = 1; i <= 12; i++) {
			for (j = 1; j <= d[i]; j++) {
				if (i == j / 10 + j % 10) {
					s++;
				}
			}
		}
		System.out.print(s);
	}

}