#include <stdio.h>

int month[]={0,31,28,31,30,31,30,31,31,30,31,30,31};

int happyday(void)
{
	int i,j;
	int count = 0;
	
	for(i=1;i<=12;i++){
		for(j=1;j<=month[i];j++){
			if(i==(j/10+j%10))
				count++;
		}
	}
	
	return count;
}

int main(void)
{
	printf("%d\n",happyday());
	
	return 0;
}