#include <iostream>
#include <vector>

const std::vector<int>
    days{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

void solve() {
    int ans = 0;

    for (int m = 1; m <= 12; ++m) {
        for (int d = 1; d <= days[m]; ++d) {
            int dd = d;
            int s = 0;
            while (dd > 0) {
                s += dd % 10;
                dd /= 10;
            }
            if (m == s) ++ans;
        }
    }

    std::cout << ans << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::cout.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}