#include<iostream>

using namespace std;

int main(){
    int month, day, dayMax, digit, tenplace, happyDay=0;
    for(month=1;month<=12;month++){
	if(month == 2){
	    dayMax = 28;
	}else if(month == 1 || month == 3 || month == 5 || month == 7
		 || month == 8 || month == 10 || month == 12){
	    dayMax = 31;
	}else{
	    dayMax = 30;
	}
	for(day=1;day<=dayMax;day++){
	    tenplace = day / 10;
	    digit = day % 10;
	    if(month == (tenplace + digit)){
		happyDay += 1;
	    }
	}
    }
    cout << happyDay << endl;
}