#include <stdio.h>

int main(void){
	int daysOfMonth[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
	int i, j, result = 0;

	for(i=0; i<12; i++){
		for(j=1; j<=daysOfMonth[i]; j++){
			if(i+1 == j/10+j%10)
				result++;
		}
	}

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

	return 0;
}