#include <bits/stdc++.h>

using namespace std;
typedef pair<int, int> P;
typedef pair<P, P> P2;

int main() {
  int up[12] = {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 = 1; j <= up[i]; ++j) {
      int b = 0;
      int tmp = j;
      while (tmp > 0) {
	b += tmp % 10;
	tmp /= 10;
      }
      if (m == b) {
	ans++;
      }
    }
  }
  cout << ans << '\n';
  return 0;
}