#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int d[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int ret = 0;
  for (int y = 1; y <= 31; y++) {
    int x = y / 10 + y % 10;
    if (x <= 12 && y <= d[x])
      ++ret;
  }  
  cout << ret << endl;
  
  return 0;
}