#include <stdio.h>
int main(void){
	int ans = 0;
	for(int month = 1; month <= 12; month++){
		for(int day = 1; day <= 31; day++){
			if(day >= 29 && month == 2){
				break;
			}
			if(day >= 31){
				if(month == 4 || month == 6 || month == 9 || month == 11){
					break;
				}
			}
			int a = (day % 10) + (day / 10);
			if(a == month){
				ans++;
			}
		}
	}
	printf("%d\n", ans);
	return 0;
}