import java.io.PrintWriter;
public class Main {

	public static void main(String[] args) {
		PrintWriter out = new PrintWriter(System.out);
		int[] day = {31,28,31,30,31,30,31,31,30,31,30,31};
		int sum = 0;
		for(int i=0;i<day.length;i++){
			for(int j=0;j<day[i];j++){
				if(i == j/10+j%10) sum++;
			}
		}
		out.println(sum);
		out.flush();
		
	}
}