import java.util.Calendar;


public class no188 {
	public static void main(String[] args) {
		int cnt = 0;
		Calendar calendar = Calendar.getInstance();
		calendar.set(2015, 0, 1);
		while(true){
			int month = calendar.get(Calendar.MONTH)+1;
			int date = calendar.get(Calendar.DATE);
			int len = String.valueOf(date).length();
			if(len==1){
				if(month==date){
					cnt++;
				}
			}
			if(len==2){
				if(month==((date/10)+(date%10))){
					cnt++;
				}
			}
			if(month==12&&date==31){
				break;
			}
			calendar.add(Calendar.DATE,1);
		}
		System.out.println(cnt);

	}

}