#include <bits/stdc++.h>
using namespace std;
int digitSum(int x) {
    int ret = 0;
    while (x != 0) {
        ret += x % 10;
        x /= 10;
    }
    return ret;
}
int main() {
    int day[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    // Calculate
    int ans = 0;
    for (int i = 1; i <= 12; ++i) {
        for (int j = 1; j <= day[i]; ++j) {
            if (i == digitSum(j)) ++ans;
        }
    }

    // Output
    cout << ans << endl;
}