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

int main() {
  struct tm t = {};
  t.tm_year = 2015;
  t.tm_mon = 0;
  t.tm_mday = 1;
  int ans = 0;
  for (int i = 0; i < 365; i++) {
    int d = t.tm_mday;
    if (t.tm_mon + 1 == d / 10 + d % 10) {
      // printf("%04d/%02d/%02d\n", t.tm_year, t.tm_mon + 1, t.tm_mday);
      ans++;
    }
    t.tm_mday++;
    mktime(&t);
  }
  cout << ans << "\n";
}