// No.188 HAPPY DAY
#include <iostream>
using namespace std;
const int d[] = { 31, 28, 31, 30,
                  31, 30, 31, 31,
                  30, 31, 30, 31};

int main() {
    int res = 0;
    for (int i = 1; i <= 12; ++i) {
        for (int j = 1; j <= d[i - 1]; ++j) {
            if (i == j / 10 + j % 10) ++res;
        }
    }
    cout << res << endl;
}