package no188;

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