#include<stdio.h>

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

	  return 0;

}