#include <stdio.h>

int main(void)
{
	int i, j;
	int sumday;
	int count = 0;
	int days[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

	for (i = 1; i <= 12; i++)
		for (j = 1; j <= days[i]; j++) {
			sumday = j % 10;
			sumday += j / 10;
			if (i == sumday) 
				count++;
		}
	printf("%d\n", count);

	return 0;
}