#include <bits/stdc++.h>

using namespace std;

int main(void) {
  int ans = 0;
  int days[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  for (int i = 1; i <= 12; i++) {
    for (int j = 1; j <= days[i]; j++) {
      ans += i == j / 10 + j % 10;
    }
  }

  cout << ans << endl;

  return 0;
}