#include<iostream>
using namespace std;

int main()
{
    int month[12]={1,2,3,4,5,6,7,8,9,10,11,12};
    int day[12]={31,28,31,30,31,30,31,31,30,30,30,31};
    
    int happy_day=0;
    for(int i=0; i<12; i++) {
            for(int j=1; j<=day[i]; j++) {
                if(month[i] == j/10+j%10){
                    happy_day++;
                }
            }
    }
    cout << happy_day << endl;
    return 0;
}