#include <stdio.h>

int main(void) {
	int i, j, count;
	int month[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	
	count = 0;
	for(i = 1;i <= 12;i++){
		for(j = 1;j <= month[i - 1];j++){
			if(i == j / 10 + j % 10){
				count++;
			}
		}
	}
	printf("%d\n", count);
	
	return 0;
}