import java.util.*;

class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		
		Calendar cl = Calendar.getInstance();
		cl.set(2014, 11, 31);
		int ans = 0;
		for (int i=0; i<365; i++) {
			cl.add(Calendar.DATE, 1);
			int m = cl.get(Calendar.MONTH)+1;
			int d = cl.get(Calendar.DAY_OF_MONTH);
			if (m == d/10+d%10) ans++;
		}
		System.out.println(ans);
		
	}
}