#include<stdio.h>

int main(void)
{
	int month_date[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
	int happyDay = 0;

	for (int month = 1; month < 12 + 1; month++) {
		for (int date = 1; date < month_date[month - 1]; date++) {
			if (month == (date / 10) + (date % 10))
			{
				happyDay++;
			}
		}
	}
	printf("%d\n", happyDay);

	return 0;
}