//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int siz(string s){
  return (int)s.size();
}

int main(){
  vector<int> M = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  int ans = 0;
  
  for(int i = 1; i <= 12; i++){
    for(int j = 1; j <= M[i]; j++){
      int k = j, sum = 0;
      
      while(k > 0){
        sum += k%10;
        k /= 10;
      }
      
      if(i == sum) ans++;
    }
  }
  
  printl(ans);
  return 0;
}