#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;

int main() {
  vector<int> day = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  int ans = 0, month = 1, i = 1;
  while(month < 13){
    if(day[month] < i){
      month++;
      i = 1;
      continue;
    }
    int sum = 0, j = i;
    while(0 < j){
      sum += j%10;
      j /= 10;
    }
    if(month == sum) ans++;
    i++;
  }
  cout << ans << endl;
}