#include <stdio.h>

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