#include <iostream>

using namespace std;


int main() {
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);

  int days[] = {31, 28, 31, 30,
		31, 30, 31, 31,
		30, 31, 30, 31};
  int ans = 0;
  for(int i=0;i<12;i++){
    int m = i+1;
    for(int j=0;j<days[i];j++){
      int d1 = j / 10;
      int d2 = j % 10;
      int s = d1 + d2;
      if(m == s){
	ans++;
	// cout << m << " " << j << endl;
      }
    }
  }
  cout << ans << endl;

  return 0;
}