#include <iostream>
#include <vector>
using namespace std;
                                                                                                
  
int main(){

   
    vector<int> d = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };


    int i;

    int k = 0;


    for( i = 1 ; i <= 12 ; i = i + 1 ){

         for(  ; d.at(i - 1) > 0 ; d.at(i - 1) = d.at(i - 1) - 1 ){

              if( i ==  ( d.at(i - 1) / 10 ) + ( d.at(i - 1) % 10 ) ) k += 1;

              }

         }


    cout << k << endl;
                                            

    return 0;

}