#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

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

  int cal[13]{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

  int ans = 0;
  rep(i, 1, 13) {
    int days = cal[i];
    rep(j, 1, days + 1) {
      if (j <= 10) {
        if (i == j)
          ans++;
      } else {
        if (i == (j / 10) + (j % 10))
          ans++;
      }
    }
  }
  cout << ans << endl;
}