public class HappyDay {
	public static void main(String[] args) {
		int[] month = {31,28,31,30,31,30,31,31,30,31,31,30,31};
		int count = 0;
		for(int m = 1; m <= 12; m++){
			for(int d = 0; d < month[m-1]; d++){
				if(m == d / 10 + d % 10){
					count++;
				}
			}
		}
		System.out.println(count);
	}
}