#include <stdio.h>
#include <stdlib.h>

int happy_day = 0;
void check_day(int month, int day);

int main(void)
{
	int i, j;

	for (i = 1; i <= 12; i++) {
		for (j = 1; j <= 30; j++) {
			check_day(i, j);
		}
	}

	printf("%d\n", happy_day);

	return 0;
}

void check_day(int month, int day)
{
	int ten = day/10, one = day%10;
	if (month == ten+one) {
		happy_day++;
	}
}