import java.util.Calendar;
import java.util.Scanner;

public class Main{

	static final Scanner s=new Scanner(System.in);

	public static void main(String args[]){
		input();
		solve();
	}

	private static void input(){
	}

	private static void solve(){
		Calendar calendar = Calendar.getInstance();
		calendar.setLenient(true);
		calendar.set(2015,0,1);
		int res=1;
		for(int i=1;i<365;i++) {
			calendar.add(Calendar.DAY_OF_YEAR,1);
			int
			m=calendar.get(Calendar.MONTH)+1,
			d=calendar.get(Calendar.DAY_OF_MONTH);
			if(m==d/10+(d%10))
				res++;
		}
		System.out.println(res);
		//System.out.println(calendar.toString().replaceAll(",",",\n"));
	}
}