#include <stdio.h>
int main()
{
	int monthdays[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
	int month;
	int day;
	int count =0;

	for (month = 1; month <= 12; month++)
	{
		for (day = 1; day <= monthdays[month - 1]; day++)
		{
			if (month == day / 10 + day % 10)
			{
				count++;
			}
		}
	}
	printf("%d\n", count);

	return 0;
}