#include<stdio.h>
main(){
	int day_array[12]={31,28,31,30,31,30,31,31,30,31,30,31};
	int month,day;
	int day_total=0;
	int happy_days=0;
	
	
	
	for(month=1;month<12;month++){
	  for(day=1;day<day_array[month-1];day++){
	    day_total=day/10;
	    day_total+=day%10;
	    
	    if(month==day_total){
	      happy_days++;
	}
	}
	}
	
	printf("%d",happy_days);
	return 0;
	}